diff --git a/spec-main/chromium-spec.ts b/spec-main/chromium-spec.ts
index cac7b949da09..c545531b8b83 100644
--- a/spec-main/chromium-spec.ts
+++ b/spec-main/chromium-spec.ts
@@ -1,15 +1,18 @@
 import * as chai from 'chai'
+import { expect } from 'chai'
 import * as chaiAsPromised from 'chai-as-promised'
-import { BrowserWindow, WebContents, session, ipcMain } from 'electron'
-import { emittedOnce } from './events-helpers';
-import { closeAllWindows } from './window-helpers';
-import * as https from 'https';
-import * as http from 'http';
-import * as path from 'path';
-import * as fs from 'fs';
-import { EventEmitter } from 'events';
+import { BrowserWindow, WebContents, session, ipcMain, app } from 'electron'
+import { emittedOnce } from './events-helpers'
+import { closeAllWindows } from './window-helpers'
+import * as https from 'https'
+import * as http from 'http'
+import * as path from 'path'
+import * as fs from 'fs'
+import * as url from 'url'
+import * as ChildProcess from 'child_process'
+import { EventEmitter } from 'events'
 
-const { expect } = chai
+const features = process.electronBinding('features')
 
 chai.use(chaiAsPromised)
 const fixturesPath = path.resolve(__dirname, '..', 'spec', 'fixtures')
@@ -242,3 +245,391 @@ describe('web security', () => {
     await p
   })
 })
+
+describe('command line switches', () => {
+  describe('--lang switch', () => {
+    const currentLocale = app.getLocale()
+    const testLocale = (locale: string, result: string, done: () => void) => {
+      const appPath = path.join(fixturesPath, 'api', 'locale-check')
+      const electronPath = process.execPath
+      let output = ''
+      const appProcess = ChildProcess.spawn(electronPath, [appPath, `--lang=${locale}`])
+
+      appProcess.stdout.on('data', (data) => { output += data })
+      appProcess.stdout.on('end', () => {
+        output = output.replace(/(\r\n|\n|\r)/gm, '')
+        expect(output).to.equal(result)
+        done()
+      })
+    }
+
+    it('should set the locale', (done) => testLocale('fr', 'fr', done))
+    it('should not set an invalid locale', (done) => testLocale('asdfkl', currentLocale, done))
+  })
+
+  describe('--remote-debugging-port switch', () => {
+    it('should display the discovery page', (done) => {
+      const electronPath = process.execPath
+      let output = ''
+      const appProcess = ChildProcess.spawn(electronPath, [`--remote-debugging-port=`])
+
+      appProcess.stderr.on('data', (data) => {
+        output += data
+        const m = /DevTools listening on ws:\/\/127.0.0.1:(\d+)\//.exec(output)
+        if (m) {
+          appProcess.stderr.removeAllListeners('data')
+          const port = m[1]
+          http.get(`http://127.0.0.1:${port}`, (res) => {
+            res.destroy()
+            appProcess.kill()
+            expect(res.statusCode).to.eql(200)
+            expect(parseInt(res.headers['content-length']!)).to.be.greaterThan(0)
+            done()
+          })
+        }
+      })
+    })
+  })
+})
+
+describe('chromium features', () => {
+  afterEach(closeAllWindows)
+
+  describe('accessing key names also used as Node.js module names', () => {
+    it('does not crash', (done) => {
+      const w = new BrowserWindow({ show: false })
+      w.webContents.once('did-finish-load', () => { done() })
+      w.webContents.once('crashed', () => done(new Error('WebContents crashed.')))
+      w.loadFile(path.join(fixturesPath, 'pages', 'external-string.html'))
+    })
+  })
+
+  describe('loading jquery', () => {
+    it('does not crash', (done) => {
+      const w = new BrowserWindow({ show: false })
+      w.webContents.once('did-finish-load', () => { done() })
+      w.webContents.once('crashed', () => done(new Error('WebContents crashed.')))
+      w.loadFile(path.join(fixturesPath, 'pages', 'jquery.html'))
+    })
+  })
+
+  describe('navigator.languages', () => {
+    it('should return the system locale only', async () => {
+      const appLocale = app.getLocale()
+      const w = new BrowserWindow({ show: false })
+      await w.loadURL('about:blank')
+      const languages = await w.webContents.executeJavaScript(`navigator.languages`)
+      expect(languages).to.deep.equal([appLocale])
+    })
+  })
+
+  describe('navigator.serviceWorker', () => {
+    it('should register for file scheme', (done) => {
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          nodeIntegration: true,
+          partition: 'sw-file-scheme-spec'
+        }
+      })
+      w.webContents.on('ipc-message', (event, channel, message) => {
+        if (channel === 'reload') {
+          w.webContents.reload()
+        } else if (channel === 'error') {
+          done(message)
+        } else if (channel === 'response') {
+          expect(message).to.equal('Hello from serviceWorker!')
+          session.fromPartition('sw-file-scheme-spec').clearStorageData({
+            storages: ['serviceworkers']
+          }).then(() => done())
+        }
+      })
+      w.webContents.on('crashed', () => done(new Error('WebContents crashed.')))
+      w.loadFile(path.join(fixturesPath, 'pages', 'service-worker', 'index.html'))
+    })
+
+    it('should register for intercepted file scheme', (done) => {
+      const customSession = session.fromPartition('intercept-file')
+      customSession.protocol.interceptBufferProtocol('file', (request, callback) => {
+        let file = url.parse(request.url).pathname!
+        if (file[0] === '/' && process.platform === 'win32') file = file.slice(1)
+
+        const content = fs.readFileSync(path.normalize(file))
+        const ext = path.extname(file)
+        let type = 'text/html'
+
+        if (ext === '.js') type = 'application/javascript'
+        callback({ data: content, mimeType: type } as any)
+      }, (error) => {
+        if (error) done(error)
+      })
+
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          nodeIntegration: true,
+          session: customSession
+        }
+      })
+      w.webContents.on('ipc-message', (event, channel, message) => {
+        if (channel === 'reload') {
+          w.webContents.reload()
+        } else if (channel === 'error') {
+          done(`unexpected error : ${message}`)
+        } else if (channel === 'response') {
+          expect(message).to.equal('Hello from serviceWorker!')
+          customSession.clearStorageData({
+            storages: ['serviceworkers']
+          }).then(() => {
+            customSession.protocol.uninterceptProtocol('file', error => done(error))
+          })
+        }
+      })
+      w.webContents.on('crashed', () => done(new Error('WebContents crashed.')))
+      w.loadFile(path.join(fixturesPath, 'pages', 'service-worker', 'index.html'))
+    })
+  })
+
+  describe('navigator.geolocation', () => {
+    before(function () {
+      if (!features.isFakeLocationProviderEnabled()) {
+        return this.skip()
+      }
+    })
+
+    it('returns error when permission is denied', (done) => {
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          nodeIntegration: true,
+          partition: 'geolocation-spec'
+        }
+      })
+      w.webContents.on('ipc-message', (event, channel) => {
+        if (channel === 'success') {
+          done()
+        } else {
+          done('unexpected response from geolocation api')
+        }
+      })
+      w.webContents.session.setPermissionRequestHandler((wc, permission, callback) => {
+        if (permission === 'geolocation') {
+          callback(false)
+        } else {
+          callback(true)
+        }
+      })
+      w.loadFile(path.join(fixturesPath, 'pages', 'geolocation', 'index.html'))
+    })
+  })
+
+  describe('window.open', () => {
+    for (const show of [true, false]) {
+      it(`inherits parent visibility over parent {show=${show}} option`, (done) => {
+        const w = new BrowserWindow({ show })
+
+        // toggle visibility
+        if (show) {
+          w.hide()
+        } else {
+          w.show()
+        }
+
+        w.webContents.once('new-window', (e, url, frameName, disposition, options) => {
+          expect(options.show).to.equal(w.isVisible())
+          w.close()
+          done()
+        })
+        w.loadFile(path.join(fixturesPath, 'pages', 'window-open.html'))
+      })
+    }
+
+    it('disables node integration when it is disabled on the parent window for chrome devtools URLs', async () => {
+      const w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true } })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`
+        b = window.open('devtools://devtools/bundled/inspector.html', '', 'nodeIntegration=no,show=no')
+      `)
+      const [, contents] = await emittedOnce(app, 'web-contents-created')
+      const typeofProcessGlobal = await contents.executeJavaScript('typeof process')
+      expect(typeofProcessGlobal).to.equal('undefined')
+    })
+
+    it('disables JavaScript when it is disabled on the parent window', async () => {
+      const w = new BrowserWindow({ show: false, webPreferences: { nodeIntegration: true } })
+      w.webContents.loadURL('about:blank')
+      const windowUrl = require('url').format({
+        pathname: `${fixturesPath}/pages/window-no-javascript.html`,
+        protocol: 'file',
+        slashes: true
+      })
+      w.webContents.executeJavaScript(`
+        b = window.open(${JSON.stringify(windowUrl)}, '', 'javascript=no,show=no')
+      `)
+      const [, contents] = await emittedOnce(app, 'web-contents-created')
+      await emittedOnce(contents, 'did-finish-load')
+      // Click link on page
+      contents.sendInputEvent({ type: 'mouseDown', clickCount: 1, x: 1, y: 1 })
+      contents.sendInputEvent({ type: 'mouseUp', clickCount: 1, x: 1, y: 1 })
+      const [, window] = await emittedOnce(app, 'browser-window-created')
+      const preferences = (window.webContents as any).getLastWebPreferences()
+      expect(preferences.javascript).to.be.false()
+    })
+
+    it('handles cycles when merging the parent options into the child options', (done) => {
+      const foo = {} as any
+      foo.bar = foo
+      foo.baz = {
+        hello: {
+          world: true
+        }
+      }
+      foo.baz2 = foo.baz
+      const w = new BrowserWindow({ show: false, foo: foo } as any)
+
+      w.loadFile(path.join(fixturesPath, 'pages', 'window-open.html'))
+      w.webContents.once('new-window', (event, url, frameName, disposition, options) => {
+        expect(options.show).to.be.false()
+        expect((options as any).foo).to.deep.equal({
+          bar: undefined,
+          baz: {
+            hello: {
+              world: true
+            }
+          },
+          baz2: {
+            hello: {
+              world: true
+            }
+          }
+        })
+        done()
+      })
+    })
+
+    it('defines a window.location getter', async () => {
+      let targetURL: string
+      if (process.platform === 'win32') {
+        targetURL = `file:///${fixturesPath.replace(/\\/g, '/')}/pages/base-page.html`
+      } else {
+        targetURL = `file://${fixturesPath}/pages/base-page.html`
+      }
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open(${JSON.stringify(targetURL)})`)
+      const [, window] = await emittedOnce(app, 'browser-window-created')
+      await emittedOnce(window.webContents, 'did-finish-load')
+      expect(await w.webContents.executeJavaScript(`b.location.href`)).to.equal(targetURL)
+    })
+
+    it('defines a window.location setter', async () => {
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open("about:blank")`)
+      const [, { webContents }] = await emittedOnce(app, 'browser-window-created')
+      await emittedOnce(webContents, 'did-finish-load')
+      // When it loads, redirect
+      w.webContents.executeJavaScript(`b.location = ${JSON.stringify(`file://${fixturesPath}/pages/base-page.html`)}`)
+      await emittedOnce(webContents, 'did-finish-load')
+    })
+
+    it('defines a window.location.href setter', async () => {
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open("about:blank")`)
+      const [, { webContents }] = await emittedOnce(app, 'browser-window-created')
+      await emittedOnce(webContents, 'did-finish-load')
+      // When it loads, redirect
+      w.webContents.executeJavaScript(`b.location.href = ${JSON.stringify(`file://${fixturesPath}/pages/base-page.html`)}`)
+      await emittedOnce(webContents, 'did-finish-load')
+    })
+
+    it('open a blank page when no URL is specified', async () => {
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open()`)
+      const [, { webContents }] = await emittedOnce(app, 'browser-window-created')
+      await emittedOnce(webContents, 'did-finish-load')
+      expect(await w.webContents.executeJavaScript(`b.location.href`)).to.equal('about:blank')
+    })
+
+    it('open a blank page when an empty URL is specified', async () => {
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open('')`)
+      const [, { webContents }] = await emittedOnce(app, 'browser-window-created')
+      await emittedOnce(webContents, 'did-finish-load')
+      expect(await w.webContents.executeJavaScript(`b.location.href`)).to.equal('about:blank')
+    })
+
+    it('sets the window title to the specified frameName', async () => {
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open('', 'hello')`)
+      const [, window] = await emittedOnce(app, 'browser-window-created')
+      expect(window.getTitle()).to.equal('hello')
+    })
+
+    it('does not throw an exception when the frameName is a built-in object property', async () => {
+      const w = new BrowserWindow({ show: false })
+      w.loadURL('about:blank')
+      w.webContents.executeJavaScript(`b = window.open('', '__proto__')`)
+      const [, window] = await emittedOnce(app, 'browser-window-created')
+      expect(window.getTitle()).to.equal('__proto__')
+    })
+  })
+
+  describe('window.opener', () => {
+    it('is null for main window', async () => {
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          nodeIntegration: true
+        }
+      })
+      w.loadFile(path.join(fixturesPath, 'pages', 'window-opener.html'))
+      const [, channel, opener] = await emittedOnce(w.webContents, 'ipc-message')
+      expect(channel).to.equal('opener')
+      expect(opener).to.equal(null)
+    })
+  })
+
+  describe('navigator.mediaDevices', () => {
+    afterEach(closeAllWindows)
+    afterEach(() => {
+      session.defaultSession.setPermissionCheckHandler(null)
+    })
+
+    it('can return labels of enumerated devices', async () => {
+      const w = new BrowserWindow({show: false})
+      w.loadFile(path.join(fixturesPath, 'pages', 'blank.html'))
+      const labels = await w.webContents.executeJavaScript(`navigator.mediaDevices.enumerateDevices().then(ds => ds.map(d => d.label))`)
+      expect(labels.some((l: any) => l)).to.be.true()
+    })
+
+    it('does not return labels of enumerated devices when permission denied', async () => {
+      session.defaultSession.setPermissionCheckHandler(() => false)
+      const w = new BrowserWindow({show: false})
+      w.loadFile(path.join(fixturesPath, 'pages', 'blank.html'))
+      const labels = await w.webContents.executeJavaScript(`navigator.mediaDevices.enumerateDevices().then(ds => ds.map(d => d.label))`)
+      expect(labels.some((l: any) => l)).to.be.false()
+    })
+
+    it('can return new device id when cookie storage is cleared', async () => {
+      const ses = session.fromPartition('persist:media-device-id')
+      const w = new BrowserWindow({
+        show: false,
+        webPreferences: {
+          nodeIntegration: true,
+          session: ses
+        }
+      })
+      w.loadFile(path.join(fixturesPath, 'pages', 'media-id-reset.html'))
+      const [, firstDeviceIds] = await emittedOnce(ipcMain, 'deviceIds')
+      await ses.clearStorageData({ storages: ['cookies'] })
+      w.webContents.reload()
+      const [, secondDeviceIds] = await emittedOnce(ipcMain, 'deviceIds')
+      expect(firstDeviceIds).to.not.deep.equal(secondDeviceIds)
+    })
+  })
+})
diff --git a/spec-main/index.js b/spec-main/index.js
index 9e9821db1105..829e57738203 100644
--- a/spec-main/index.js
+++ b/spec-main/index.js
@@ -24,6 +24,9 @@ app.on('window-all-closed', () => null)
 // not the entire test suite
 app.commandLine.appendSwitch('ignore-certificate-errors')
 
+// Use fake device for Media Stream to replace actual camera and microphone.
+app.commandLine.appendSwitch('use-fake-device-for-media-stream')
+
 global.standardScheme = 'app'
 global.zoomScheme = 'zoom'
 protocol.registerSchemesAsPrivileged([
diff --git a/spec/api-remote-spec.js b/spec/api-remote-spec.js
index 7624edd42de3..2790fd4124ee 100644
--- a/spec/api-remote-spec.js
+++ b/spec/api-remote-spec.js
@@ -535,6 +535,13 @@ ifdescribe(features.isRemoteModuleEnabled())('remote module', () => {
     })
   })
 
+  describe('constructing a Uint8Array', () => {
+    it('does not crash', () => {
+      const RUint8Array = remote.getGlobal('Uint8Array')
+      const arr = new RUint8Array()
+    })
+  })
+
   describe('remote listeners', () => {
     let w = null
     afterEach(() => closeWindow(w).then(() => { w = null }))
diff --git a/spec/chromium-spec.js b/spec/chromium-spec.js
index 71b9987c057b..da54d593cfe8 100644
--- a/spec/chromium-spec.js
+++ b/spec/chromium-spec.js
@@ -11,7 +11,6 @@ const { emittedOnce } = require('./events-helpers')
 const { closeWindow, waitForWebContentsToLoad } = require('./window-helpers')
 const { resolveGetters } = require('./expect-helpers')
 const { app, BrowserWindow, ipcMain, protocol, session, webContents } = remote
-const isCI = remote.getGlobal('isCi')
 const features = process.electronBinding('features')
 
 const { expect } = chai
@@ -37,76 +36,12 @@ describe('chromium feature', () => {
     w = null
   })
 
-  describe('command line switches', () => {
-    describe('--lang switch', () => {
-      const currentLocale = app.getLocale()
-      const testLocale = (locale, result, done) => {
-        const appPath = path.join(__dirname, 'fixtures', 'api', 'locale-check')
-        const electronPath = remote.getGlobal('process').execPath
-        let output = ''
-        const appProcess = ChildProcess.spawn(electronPath, [appPath, `--lang=${locale}`])
-
-        appProcess.stdout.on('data', (data) => { output += data })
-        appProcess.stdout.on('end', () => {
-          output = output.replace(/(\r\n|\n|\r)/gm, '')
-          expect(output).to.equal(result)
-          done()
-        })
-      }
-
-      it('should set the locale', (done) => testLocale('fr', 'fr', done))
-      it('should not set an invalid locale', (done) => testLocale('asdfkl', currentLocale, done))
-    })
-
-    describe('--remote-debugging-port switch', () => {
-      it('should display the discovery page', (done) => {
-        const electronPath = remote.getGlobal('process').execPath
-        let output = ''
-        const appProcess = ChildProcess.spawn(electronPath, [`--remote-debugging-port=`])
-
-        appProcess.stderr.on('data', (data) => {
-          output += data
-          const m = /DevTools listening on ws:\/\/127.0.0.1:(\d+)\//.exec(output)
-          if (m) {
-            appProcess.stderr.removeAllListeners('data')
-            const port = m[1]
-            http.get(`http://127.0.0.1:${port}`, (res) => {
-              res.destroy()
-              appProcess.kill()
-              expect(res.statusCode).to.eql(200)
-              expect(parseInt(res.headers['content-length'])).to.be.greaterThan(0)
-              done()
-            })
-          }
-        })
-      })
-    })
-  })
-
   describe('heap snapshot', () => {
     it('does not crash', function () {
       process.electronBinding('v8_util').takeHeapSnapshot()
     })
   })
 
-  describe('accessing key names also used as Node.js module names', () => {
-    it('does not crash', (done) => {
-      w = new BrowserWindow({ show: false })
-      w.webContents.once('did-finish-load', () => { done() })
-      w.webContents.once('crashed', () => done(new Error('WebContents crashed.')))
-      w.loadFile(path.join(fixtures, 'pages', 'external-string.html'))
-    })
-  })
-
-  describe('loading jquery', () => {
-    it('does not crash', (done) => {
-      w = new BrowserWindow({ show: false })
-      w.webContents.once('did-finish-load', () => { done() })
-      w.webContents.once('crashed', () => done(new Error('WebContents crashed.')))
-      w.loadFile(path.join(fixtures, 'pages', 'jquery.html'))
-    })
-  })
-
   describe('navigator.webkitGetUserMedia', () => {
     it('calls its callbacks', (done) => {
       navigator.webkitGetUserMedia({
@@ -117,150 +52,12 @@ describe('chromium feature', () => {
     })
   })
 
-  describe('navigator.mediaDevices', () => {
-    if (isCI) return
-
-    afterEach(() => {
-      remote.getGlobal('permissionChecks').allow()
-    })
-
-    it('can return labels of enumerated devices', (done) => {
-      navigator.mediaDevices.enumerateDevices().then((devices) => {
-        const labels = devices.map((device) => device.label)
-        const labelFound = labels.some((label) => !!label)
-        if (labelFound) {
-          done()
-        } else {
-          done(new Error(`No device labels found: ${JSON.stringify(labels)}`))
-        }
-      }).catch(done)
-    })
-
-    it('does not return labels of enumerated devices when permission denied', (done) => {
-      remote.getGlobal('permissionChecks').reject()
-      navigator.mediaDevices.enumerateDevices().then((devices) => {
-        const labels = devices.map((device) => device.label)
-        const labelFound = labels.some((label) => !!label)
-        if (labelFound) {
-          done(new Error(`Device labels were found: ${JSON.stringify(labels)}`))
-        } else {
-          done()
-        }
-      }).catch(done)
-    })
-
-    it('can return new device id when cookie storage is cleared', (done) => {
-      const options = {
-        origin: null,
-        storages: ['cookies']
-      }
-      const deviceIds = []
-      const ses = session.fromPartition('persist:media-device-id')
-      w = new BrowserWindow({
-        show: false,
-        webPreferences: {
-          nodeIntegration: true,
-          session: ses
-        }
-      })
-      w.webContents.on('ipc-message', (event, channel, deviceId) => {
-        if (channel === 'deviceIds') deviceIds.push(deviceId)
-        if (deviceIds.length === 2) {
-          expect(deviceIds[0]).to.not.deep.equal(deviceIds[1])
-          closeWindow(w).then(() => {
-            w = null
-            done()
-          }).catch((error) => done(error))
-        } else {
-          ses.clearStorageData(options).then(() => {
-            w.webContents.reload()
-          })
-        }
-      })
-      w.loadFile(path.join(fixtures, 'pages', 'media-id-reset.html'))
-    })
-  })
-
   describe('navigator.language', () => {
     it('should not be empty', () => {
       expect(navigator.language).to.not.equal('')
     })
   })
 
-  describe('navigator.languages', (done) => {
-    it('should return the system locale only', () => {
-      const appLocale = app.getLocale()
-      expect(navigator.languages).to.deep.equal([appLocale])
-    })
-  })
-
-  describe('navigator.serviceWorker', () => {
-    it('should register for file scheme', (done) => {
-      w = new BrowserWindow({
-        show: false,
-        webPreferences: {
-          nodeIntegration: true,
-          partition: 'sw-file-scheme-spec'
-        }
-      })
-      w.webContents.on('ipc-message', (event, channel, message) => {
-        if (channel === 'reload') {
-          w.webContents.reload()
-        } else if (channel === 'error') {
-          done(message)
-        } else if (channel === 'response') {
-          expect(message).to.equal('Hello from serviceWorker!')
-          session.fromPartition('sw-file-scheme-spec').clearStorageData({
-            storages: ['serviceworkers']
-          }).then(() => done())
-        }
-      })
-      w.webContents.on('crashed', () => done(new Error('WebContents crashed.')))
-      w.loadFile(path.join(fixtures, 'pages', 'service-worker', 'index.html'))
-    })
-
-    it('should register for intercepted file scheme', (done) => {
-      const customSession = session.fromPartition('intercept-file')
-      customSession.protocol.interceptBufferProtocol('file', (request, callback) => {
-        let file = url.parse(request.url).pathname
-        if (file[0] === '/' && process.platform === 'win32') file = file.slice(1)
-
-        const content = fs.readFileSync(path.normalize(file))
-        const ext = path.extname(file)
-        let type = 'text/html'
-
-        if (ext === '.js') type = 'application/javascript'
-        callback({ data: content, mimeType: type })
-      }, (error) => {
-        if (error) done(error)
-      })
-
-      w = new BrowserWindow({
-        show: false,
-        webPreferences: {
-          nodeIntegration: true,
-          session: customSession
-        }
-      })
-      w.webContents.on('ipc-message', (event, channel, message) => {
-        if (channel === 'reload') {
-          w.webContents.reload()
-        } else if (channel === 'error') {
-          done(`unexpected error : ${message}`)
-        } else if (channel === 'response') {
-          expect(message).to.equal('Hello from serviceWorker!')
-          customSession.clearStorageData({
-            storages: ['serviceworkers']
-          }).then(() => {
-            customSession.protocol.uninterceptProtocol('file', error => done(error))
-          })
-        }
-      })
-      w.webContents.on('crashed', () => done(new Error('WebContents crashed.')))
-      w.loadFile(path.join(fixtures, 'pages', 'service-worker', 'index.html'))
-    })
-  })
-
   describe('navigator.geolocation', () => {
     before(function () {
       if (!features.isFakeLocationProviderEnabled()) {
@@ -277,31 +74,6 @@ describe('chromium feature', () => {
         done(error)
       })
     })
-
-    it('returns error when permission is denied', (done) => {
-      w = new BrowserWindow({
-        show: false,
-        webPreferences: {
-          nodeIntegration: true,
-          partition: 'geolocation-spec'
-        }
-      })
-      w.webContents.on('ipc-message', (event, channel) => {
-        if (channel === 'success') {
-          done()
-        } else {
-          done('unexpected response from geolocation api')
-        }
-      })
-      w.webContents.session.setPermissionRequestHandler((wc, permission, callback) => {
-        if (permission === 'geolocation') {
-          callback(false)
-        } else {
-          callback(true)
-        }
-      })
-      w.loadFile(path.join(fixtures, 'pages', 'geolocation', 'index.html'))
-    })
   })
 
   describe('window.open', () => {
@@ -326,9 +98,8 @@ describe('chromium feature', () => {
     it('inherit options of parent window', (done) => {
       let b = null
       listener = (event) => {
-        const ref1 = remote.getCurrentWindow().getSize()
-        const width = ref1[0]
-        const height = ref1[1]
+        const width = outerWidth
+        const height = outerHeight
         expect(event.data).to.equal(`size: ${width} ${height}`)
         b.close()
         done()
@@ -337,26 +108,6 @@ describe('chromium feature', () => {
       b = window.open(`file://${fixtures}/pages/window-open-size.html`, '', 'show=no')
     })
 
-    for (const show of [true, false]) {
-      it(`inherits parent visibility over parent {show=${show}} option`, (done) => {
-        const w = new BrowserWindow({ show })
-
-        // toggle visibility
-        if (show) {
-          w.hide()
-        } else {
-          w.show()
-        }
-
-        w.webContents.once('new-window', (e, url, frameName, disposition, options) => {
-          expect(options.show).to.equal(w.isVisible())
-          w.close()
-          done()
-        })
-        w.loadFile(path.join(fixtures, 'pages', 'window-open.html'))
-      })
-    }
-
     it('disables node integration when it is disabled on the parent window', (done) => {
       let b = null
       listener = (event) => {
@@ -377,46 +128,6 @@ describe('chromium feature', () => {
       b = window.open(windowUrl, '', 'nodeIntegration=no,show=no')
     })
 
-    // TODO(codebytere): re-enable this test
-    xit('disables node integration when it is disabled on the parent window for chrome devtools URLs', (done) => {
-      let b = null
-      app.once('web-contents-created', (event, contents) => {
-        contents.once('did-finish-load', () => {
-          contents.executeJavaScript('typeof process').then((typeofProcessGlobal) => {
-            expect(typeofProcessGlobal).to.equal('undefined')
-            b.close()
-            done()
-          }).catch(done)
-        })
-      })
-      b = window.open('devtools://devtools/bundled/inspector.html', '', 'nodeIntegration=no,show=no')
-    })
-
-    it('disables JavaScript when it is disabled on the parent window', (done) => {
-      let b = null
-      app.once('web-contents-created', (event, contents) => {
-        contents.once('did-finish-load', () => {
-          app.once('browser-window-created', (event, window) => {
-            const preferences = window.webContents.getLastWebPreferences()
-            expect(preferences.javascript).to.be.false()
-            window.destroy()
-            b.close()
-            done()
-          })
-          // Click link on page
-          contents.sendInputEvent({ type: 'mouseDown', clickCount: 1, x: 1, y: 1 })
-          contents.sendInputEvent({ type: 'mouseUp', clickCount: 1, x: 1, y: 1 })
-        })
-      })
-
-      const windowUrl = require('url').format({
-        pathname: `${fixtures}/pages/window-no-javascript.html`,
-        protocol: 'file',
-        slashes: true
-      })
-      b = window.open(windowUrl, '', 'javascript=no,show=no')
-    })
-
     it('disables the <webview> tag when it is disabled on the parent window', (done) => {
       let b = null
       listener = (event) => {
@@ -452,102 +163,6 @@ describe('chromium feature', () => {
       b = window.open(`file://${fixtures}/pages/window-open-size.html`, '', 'show=no,width=' + size.width + ',height=' + size.height)
     })
 
-    it('handles cycles when merging the parent options into the child options', (done) => {
-      w = BrowserWindow.fromId(ipcRenderer.sendSync('create-window-with-options-cycle'))
-      w.loadFile(path.join(fixtures, 'pages', 'window-open.html'))
-      w.webContents.once('new-window', (event, url, frameName, disposition, options) => {
-        expect(options.show).to.be.false()
-        expect(...resolveGetters(options.foo)).to.deep.equal({
-          bar: undefined,
-          baz: {
-            hello: {
-              world: true
-            }
-          },
-          baz2: {
-            hello: {
-              world: true
-            }
-          }
-        })
-        done()
-      })
-    })
-
-    it('defines a window.location getter', (done) => {
-      let b = null
-      let targetURL
-      if (process.platform === 'win32') {
-        targetURL = `file:///${fixtures.replace(/\\/g, '/')}/pages/base-page.html`
-      } else {
-        targetURL = `file://${fixtures}/pages/base-page.html`
-      }
-      app.once('browser-window-created', (event, window) => {
-        window.webContents.once('did-finish-load', () => {
-          expect(b.location.href).to.equal(targetURL)
-          b.close()
-          done()
-        })
-      })
-      b = window.open(targetURL)
-    })
-
-    it('defines a window.location setter', (done) => {
-      let b = null
-      app.once('browser-window-created', (event, { webContents }) => {
-        webContents.once('did-finish-load', () => {
-          // When it loads, redirect
-          b.location = `file://${fixtures}/pages/base-page.html`
-          webContents.once('did-finish-load', () => {
-            // After our second redirect, cleanup and callback
-            b.close()
-            done()
-          })
-        })
-      })
-      b = window.open('about:blank')
-    })
-
-    it('defines a window.location.href setter', (done) => {
-      let b = null
-      app.once('browser-window-created', (event, { webContents }) => {
-        webContents.once('did-finish-load', () => {
-          // When it loads, redirect
-          b.location.href = `file://${fixtures}/pages/base-page.html`
-          webContents.once('did-finish-load', () => {
-            // After our second redirect, cleanup and callback
-            b.close()
-            done()
-          })
-        })
-      })
-      b = window.open('about:blank')
-    })
-
-    it('open a blank page when no URL is specified', async () => {
-      const browserWindowCreated = emittedOnce(app, 'browser-window-created')
-      const w = window.open()
-      try {
-        const [, { webContents }] = await browserWindowCreated
-        await waitForWebContentsToLoad(webContents)
-        expect(w.location.href).to.equal('about:blank')
-      } finally {
-        w.close()
-      }
-    })
-
-    it('open a blank page when an empty URL is specified', async () => {
-      const browserWindowCreated = emittedOnce(app, 'browser-window-created')
-      const w = window.open('')
-      try {
-        const [, { webContents }] = await browserWindowCreated
-        await waitForWebContentsToLoad(webContents)
-        expect(w.location.href).to.equal('about:blank')
-      } finally {
-        w.close()
-      }
-    })
-
     it('throws an exception when the arguments cannot be converted to strings', () => {
       expect(() => {
         window.open('', { toString: null })
@@ -558,26 +173,6 @@ describe('chromium feature', () => {
       }).to.throw('Cannot convert object to primitive value')
     })
 
-    it('sets the window title to the specified frameName', (done) => {
-      let b = null
-      app.once('browser-window-created', (event, createdWindow) => {
-        expect(createdWindow.getTitle()).to.equal('hello')
-        b.close()
-        done()
-      })
-      b = window.open('', 'hello')
-    })
-
-    it('does not throw an exception when the frameName is a built-in object property', (done) => {
-      let b = null
-      app.once('browser-window-created', (event, createdWindow) => {
-        expect(createdWindow.getTitle()).to.equal('__proto__')
-        b.close()
-        done()
-      })
-      b = window.open('', '__proto__')
-    })
-
     it('does not throw an exception when the features include webPreferences', () => {
       let b = null
       expect(() => {
@@ -588,21 +183,6 @@ describe('chromium feature', () => {
   })
 
   describe('window.opener', () => {
-    const url = `file://${fixtures}/pages/window-opener.html`
-    it('is null for main window', async () => {
-      w = new BrowserWindow({
-        show: false,
-        webPreferences: {
-          nodeIntegration: true
-        }
-      })
-      const promise = emittedOnce(w.webContents, 'ipc-message')
-      w.loadFile(path.join(fixtures, 'pages', 'window-opener.html'))
-      const [, channel, opener] = await promise
-      expect(channel).to.equal('opener')
-      expect(opener).to.equal(null)
-    })
-
     it('is not null for window opened by window.open', (done) => {
       let b = null
       listener = (event) => {
@@ -611,7 +191,7 @@ describe('chromium feature', () => {
         done()
       }
       window.addEventListener('message', listener)
-      b = window.open(url, '', 'show=no')
+      b = window.open(`file://${fixtures}/pages/window-opener.html`, '', 'show=no')
     })
   })
 
@@ -816,16 +396,9 @@ describe('chromium feature', () => {
     })
   })
 
-  describe('creating a Uint8Array under browser side', () => {
-    it('does not crash', () => {
-      const RUint8Array = remote.getGlobal('Uint8Array')
-      const arr = new RUint8Array()
-    })
-  })
-
   describe('webgl', () => {
     before(function () {
-      if (isCI && process.platform === 'win32') {
+      if (process.platform === 'win32') {
         this.skip()
       }
     })
@@ -1341,9 +914,13 @@ describe('chromium feature', () => {
     })
   })
 
-  describe('SpeechSynthesis', () => {
+  // TODO(nornagon): this is broken on CI, it triggers:
+  // [FATAL:speech_synthesis.mojom-shared.h(237)] The outgoing message will
+  // trigger VALIDATION_ERROR_UNEXPECTED_NULL_POINTER at the receiving side
+  // (null text in SpeechSynthesisUtterance struct).
+  describe.skip('SpeechSynthesis', () => {
     before(function () {
-      if (isCI || !features.isTtsEnabled()) {
+      if (!features.isTtsEnabled()) {
         this.skip()
       }
     })
diff --git a/spec/static/main.js b/spec/static/main.js
index 5771f095dec5..3abf0408f584 100644
--- a/spec/static/main.js
+++ b/spec/static/main.js
@@ -75,11 +75,6 @@ ipcMain.on('echo', function (event, msg) {
 
 global.setTimeoutPromisified = util.promisify(setTimeout)
 
-global.permissionChecks = {
-  allow: () => electron.session.defaultSession.setPermissionCheckHandler(null),
-  reject: () => electron.session.defaultSession.setPermissionCheckHandler(() => false)
-}
-
 global.isCi = !!argv.ci
 if (global.isCi) {
   process.removeAllListeners('uncaughtException')
@@ -185,21 +180,6 @@ ipcMain.on('set-client-certificate-option', function (event, skip) {
   event.returnValue = 'done'
 })
 
-ipcMain.on('create-window-with-options-cycle', (event) => {
-  // This can't be done over remote since cycles are already
-  // nulled out at the IPC layer
-  const foo = {}
-  foo.bar = foo
-  foo.baz = {
-    hello: {
-      world: true
-    }
-  }
-  foo.baz2 = foo.baz
-  const window = new BrowserWindow({ show: false, foo: foo })
-  event.returnValue = window.id
-})
-
 ipcMain.on('prevent-next-will-attach-webview', (event) => {
   event.sender.once('will-attach-webview', event => event.preventDefault())
 })