diff --git a/.circleci/config.yml b/.circleci/config.yml
index 05693b8ae07c..e6a7f7175c58 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -102,9 +102,13 @@ build-steps: &build-steps
               mkdir junit
               script/test.py --ci --rebuild_native_modules
             else
-              echo 'Testing Electron release build'
-              mkdir junit
-              script/test.py --ci --rebuild_native_modules -c R
+              if [ "$UPLOAD_TO_S3" == "1" ]; then
+                echo 'Testing Electron release build'
+                mkdir junit
+                script/test.py --ci --rebuild_native_modules -c R
+              else
+                echo 'Skipping tests on GitHub release'
+              fi
             fi
           else
            echo 'Skipping tests due to configuration'
@@ -141,10 +145,7 @@ build-steps: &build-steps
     - store_artifacts:
         path: junit
     - store_artifacts:
-        path: out/electron.d.ts
-    - store_artifacts:
-        path: out/electron-api.json
-
+        path: out
 
 build-defaults: &build-defaults
   docker:
diff --git a/DEPS b/DEPS
index fabfeaa434c3..1b963187bb1a 100644
--- a/DEPS
+++ b/DEPS
@@ -2,7 +2,7 @@ vars = {
   'chromium_version':
     '66.0.3359.181',
   'libchromiumcontent_revision':
-    'ff1c994b0e4f5ddf664478aea0c836ba84479ea8',
+    '83a05b94ef363d574030ec2f018ec758e8314c19',
   'node_version':
     'v10.2.0-35-g4879332def',
 
diff --git a/appveyor.yml b/appveyor.yml
index f86a34c804df..60a97ce048a5 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,28 +1,26 @@
 version: 1.0.{build}
+branches:
+  except:
+  - /^release$|^release-\d-\d-x$/
 build_cloud: electron-16
 image: electron-16-vs2017
 environment:
   DISABLE_CRASH_REPORTER_TESTS: true
-  matrix:
-  - TARGET_ARCH: ia32
-  - TARGET_ARCH: x64
 build_script:
 - ps: >-
     if(($env:APPVEYOR_PULL_REQUEST_HEAD_REPO_NAME -split "/")[0] -eq ($env:APPVEYOR_REPO_NAME -split "/")[0]) {
       Write-warning "Skipping PR build for branch"; Exit-AppveyorBuild
-
     } else {
       Add-Path "$env:ProgramFiles (x86)\Windows Kits\10\Debuggers\x64"
-
       $env:path = "$env:ProgramFiles (x86)\Windows Kits\10\Debuggers\x64;$env:path"
-
+      if($env:APPVEYOR_SCHEDULED_BUILD -eq 'True')  {
+        $env:RUN_RELEASE_BUILD = "1"
+      }
       $Message = (git log --format=%B -n 1 HEAD) | Out-String
-
       if ((Test-Path Env:\RUN_RELEASE_BUILD)) {
         $env:ELECTRON_RELEASE = '1'
         Write-Output "release build triggered from api"
       }
-
       if ((Test-Path Env:\ELECTRON_RELEASE)) {
         Write-Output "Running release build"
         python script\bootstrap.py --target_arch=$env:TARGET_ARCH
@@ -38,8 +36,8 @@ build_script:
       } else {
         "Build succeeded."
       }
+      Push-AppveyorArtifact out
     }
-
 test_script:
 - ps: >-
     if (Test-Path Env:\ELECTRON_RELEASE) {
@@ -53,7 +51,6 @@ test_script:
         Write-Output "Tests succeeded."
       }
       python script\verify-ffmpeg.py
-
       if ($LASTEXITCODE -ne '0') {
         throw "Verify ffmpeg failed with exit code $LASTEXITCODE"
       } else {
@@ -61,5 +58,16 @@ test_script:
       }
     }
 artifacts:
-- path: out
-  name: out
+- path: test-results.xml
+  name: test-results.xml
+deploy_script:
+- ps: >-
+    if (Test-Path Env:\ELECTRON_RELEASE) {
+      if (Test-Path Env:\RUN_RELEASE_BUILD) {
+        Write-Output "Uploading Electron release distribution to s3"
+        & python script\upload.py --upload_to_s3
+      } else {
+        Write-Output "Uploading Electron release distribution to github releases"
+        & python script\upload.py
+      }
+    }
diff --git a/vendor/libchromiumcontent b/vendor/libchromiumcontent
index ff1c994b0e4f..83a05b94ef36 160000
--- a/vendor/libchromiumcontent
+++ b/vendor/libchromiumcontent
@@ -1 +1 @@
-Subproject commit ff1c994b0e4f5ddf664478aea0c836ba84479ea8
+Subproject commit 83a05b94ef363d574030ec2f018ec758e8314c19
diff --git a/vsts.yml b/vsts.yml
index 52faf62c0602..3e78eea25f8b 100644
--- a/vsts.yml
+++ b/vsts.yml
@@ -54,6 +54,7 @@ steps:
       script/test.py --ci --rebuild_native_modules
     fi
   name: Test
+  condition: or(ne(variables['ELECTRON_RELEASE'], '1'), eq(variables['UPLOAD_TO_S3'], '1'))
 
 - bash: |
     echo 'Verifying ffmpeg on build'
@@ -63,6 +64,7 @@ steps:
       script/verify-ffmpeg.py
     fi
   name: Verify_FFmpeg
+  condition: or(ne(variables['ELECTRON_RELEASE'], '1'), eq(variables['UPLOAD_TO_S3'], '1'))
 
 - task: PublishTestResults@2
   displayName: Publish Test Results
@@ -70,26 +72,26 @@ steps:
     testResultsFiles: '**/test-*.xml'
   condition: and(always(), eq(variables['MOCHA_FILE'], 'test-results.xml'))
 
-- task: kasunkodagoda.slack-notification.slack-notification-task.SlackNotification@3
-  displayName: Post Slack Notification on Failure
-  inputs:
-    SlackApiToken: '$(slack_token)'
-    Channel: '#bot-nightly-releases'
-    Message: 'Build failed for *<$(System.TeamFoundationCollectionUri)$(System.TeamProject)/_build/results?buildId=$(Build.BuildId)|$(Build.DefinitionName)>* nightly build.'
-    Title: '$(Build.DefinitionName) nightly build results'
-    TitleLink: '$(System.TeamFoundationCollectionUri)$(System.TeamProject)/_build/results?buildId=$(Build.BuildId)'
-    Color: '#FC5C3C'
-  condition: and(failed(), eq(variables['Build.Reason'], 'Schedule'))
+- bash: |
+    export BUILD_URL="${SYSTEM_TEAMFOUNDATIONCOLLECTIONURI}${SYSTEM_TEAMPROJECT}/_build/results?buildId=${BUILD_BUILDID}"
+    export MESSAGE="Build failed for *<$BUILD_URL|$BUILD_DEFINITIONNAME>* nightly build."
+    curl -g -H "Content-Type: application/json" -X POST \
+    -d "{\"text\": \"$MESSAGE\", \"attachments\": [{\"color\": \"#FC5C3C\",\"title\": \"$BUILD_DEFINITIONNAME nightly build results\",\"title_link\": \"$BUILD_URL\"}]}" $(slack_webhook)
+  name: Post_Slack_Notification_on_Failure
+  condition: failed()
 
-- task: kasunkodagoda.slack-notification.slack-notification-task.SlackNotification@3
-  displayName: Post Slack Notification on Success
+- bash: |
+    export BUILD_URL="${SYSTEM_TEAMFOUNDATIONCOLLECTIONURI}${SYSTEM_TEAMPROJECT}/_build/results?buildId=${BUILD_BUILDID}"
+    export MESSAGE="Build succeeded for *<$BUILD_URL|$BUILD_DEFINITIONNAME>* nightly build."
+    curl -g -H "Content-Type: application/json" -X POST \
+    -d "{\"text\": \"$MESSAGE\", \"attachments\": [{\"color\": \"#FC5C3C\",\"title\": \"$BUILD_DEFINITIONNAME nightly build results\",\"title_link\": \"$BUILD_URL\"}]}" $(slack_webhook)
+  name: Post_Slack_Notification_on_Success
+  condition: succeeded()
+
+- task: PublishBuildArtifacts@1
+  displayName: Publish Build Artifacts
   inputs:
-    SlackApiToken: '$(slack_token)'
-    Channel: '#bot-nightly-releases'
-    Message: 'Build succeeded for *<$(System.TeamFoundationCollectionUri)$(System.TeamProject)/_build/results?buildId=$(Build.BuildId)|$(Build.DefinitionName)>* nightly build.'
-    Title: '$(Build.DefinitionName) nightly build results'
-    TitleLink: '$(System.TeamFoundationCollectionUri)$(System.TeamProject)/_build/results?buildId=$(Build.BuildId)'
-    Color: 'good'
-  condition: and(succeeded(), eq(variables['Build.Reason'], 'Schedule'))
+    PathtoPublish: '$(Build.SourcesDirectory)/out'
+    ArtifactName: out
 
 - task: mspremier.PostBuildCleanup.PostBuildCleanup-task.PostBuildCleanup@3