diff --git a/atom/renderer/atom_renderer_client.cc b/atom/renderer/atom_renderer_client.cc
index 114fb90555b..4ddbe956b89 100644
--- a/atom/renderer/atom_renderer_client.cc
+++ b/atom/renderer/atom_renderer_client.cc
@@ -186,6 +186,23 @@ void AtomRendererClient::RunScriptsAtDocumentStart(
   // Make sure every page will get a script context created.
   render_frame->GetWebFrame()->executeScript(
       blink::WebScriptSource("void 0"));
+
+  // Inform the docuemnt start pharse.
+  node::Environment* env = node_bindings_->uv_env();
+  if (env) {
+    v8::HandleScope handle_scope(env->isolate());
+    mate::EmitEvent(env->isolate(), env->process_object(), "document-start");
+  }
+}
+
+void AtomRendererClient::RunScriptsAtDocumentEnd(
+    content::RenderFrame* render_frame) {
+  // Inform the docuemnt end pharse.
+  node::Environment* env = node_bindings_->uv_env();
+  if (env) {
+    v8::HandleScope handle_scope(env->isolate());
+    mate::EmitEvent(env->isolate(), env->process_object(), "document-end");
+  }
 }
 
 blink::WebSpeechSynthesizer* AtomRendererClient::OverrideSpeechSynthesizer(
diff --git a/atom/renderer/atom_renderer_client.h b/atom/renderer/atom_renderer_client.h
index 78c2e495994..1a178e01f4f 100644
--- a/atom/renderer/atom_renderer_client.h
+++ b/atom/renderer/atom_renderer_client.h
@@ -37,6 +37,7 @@ class AtomRendererClient : public content::ContentRendererClient {
   void RenderFrameCreated(content::RenderFrame*) override;
   void RenderViewCreated(content::RenderView*) override;
   void RunScriptsAtDocumentStart(content::RenderFrame* render_frame) override;
+  void RunScriptsAtDocumentEnd(content::RenderFrame* render_frame) override;
   blink::WebSpeechSynthesizer* OverrideSpeechSynthesizer(
       blink::WebSpeechSynthesizerClient* client) override;
   bool OverrideCreatePlugin(content::RenderFrame* render_frame,
diff --git a/lib/browser/chrome-extension.js b/lib/browser/chrome-extension.js
index fbf0fef5b1c..9a86e2fc34d 100644
--- a/lib/browser/chrome-extension.js
+++ b/lib/browser/chrome-extension.js
@@ -83,7 +83,7 @@ const injectContentScripts = function (manifest) {
   if (contentScripts[manifest.name] || !manifest.content_scripts) return
 
   const readArrayOfFiles = function (relativePath) {
-    return fs.readFileSync(path.join(manifest.srcDirectory, relativePath))
+    return String(fs.readFileSync(path.join(manifest.srcDirectory, relativePath)))
   }
 
   const contentScriptToEntry = function (script) {
diff --git a/lib/renderer/content-scripts-injector.js b/lib/renderer/content-scripts-injector.js
index 0594ada07bf..07f330b7cc1 100644
--- a/lib/renderer/content-scripts-injector.js
+++ b/lib/renderer/content-scripts-injector.js
@@ -1,13 +1,9 @@
-const preferences = process.getRenderProcessPreferences()
-if (!preferences || preferences.length == 0) return
-
 const {webFrame} = require('electron')
 
 // Check whether pattern matches.
 // https://developer.chrome.com/extensions/match_patterns
 const matchesPattern = function (pattern) {
-  if (pattern === '<all_urls>')
-    return true
+  if (pattern === '<all_urls>') return true
 
   const regexp = new RegExp('^' + pattern.replace(/\*/g, '.*') + '$')
   return location.href.match(regexp)
@@ -21,15 +17,23 @@ const injectContentScript = function (script) {
   }
 
   for (const js of script.js) {
+    const fire = () => webFrame.executeJavaScript(js)
     if (script.runAt === 'document_start') {
-      webFrame.executeJavaScript(String(js))
+      process.once('document-start', fire)
+    } else if (script.runAt === 'document_end') {
+      process.once('document-end', fire)
+    } else if (script.runAt === 'document_idle') {
+      document.addEventListener('DOMContentLoaded', fire)
     }
   }
 }
 
 // Read the renderer process preferences.
-for (const pref of preferences) {
-  if (pref.contentScripts) {
-    pref.contentScripts.forEach(injectContentScript)
+const preferences = process.getRenderProcessPreferences()
+if (preferences) {
+  for (const pref of preferences) {
+    if (pref.contentScripts) {
+      pref.contentScripts.forEach(injectContentScript)
+    }
   }
 }