--- a/browser/base/content/popup-notifications.inc
+++ b/browser/base/content/popup-notifications.inc
@@ -54,8 +54,14 @@
     </popupnotification>
 
     <popupnotification id="pointerLock-notification" hidden="true">
       <popupnotificationcontent orient="vertical" align="start">
         <separator class="thin"/>
         <label id="pointerLock-cancel" value="&pointerLock.notification.message;"/>
       </popupnotificationcontent>
     </popupnotification>
+
+#ifdef E10S_TESTING_ONLY
+    <popupnotification id="enable-e10s-notification" hidden="true">
+      <popupnotificationcontent orient="vertical"/>
+    </popupnotification>
+#endif

--- a/browser/components/nsBrowserGlue.js
+++ b/browser/components/nsBrowserGlue.js
@@ -102,16 +102,21 @@ XPCOMUtils.defineLazyModuleGetter(this, 
 #ifdef NIGHTLY_BUILD
 XPCOMUtils.defineLazyModuleGetter(this, "SignInToWebsiteUX",
                                   "resource:///modules/SignInToWebsite.jsm");
 #endif
 
 XPCOMUtils.defineLazyModuleGetter(this, "ContentSearch",
                                   "resource:///modules/ContentSearch.jsm");
 
+#ifdef E10S_TESTING_ONLY
+XPCOMUtils.defineLazyModuleGetter(this, "UpdateChannel",
+                                  "resource://gre/modules/UpdateChannel.jsm");
+#endif
+
 XPCOMUtils.defineLazyGetter(this, "ShellService", function() {
   try {
     return Cc["@mozilla.org/browser/shell-service;1"].
            getService(Ci.nsIShellService);
   }
   catch(ex) {
     return null;
   }
@@ -2260,22 +2265,25 @@ let DefaultBrowserCheck = {
     }
   },
 };
 
 #ifdef E10S_TESTING_ONLY
 let E10SUINotification = {
   // Increase this number each time we want to roll out an
   // e10s testing period to Nightly users.
-  CURRENT_NOTICE_COUNT: 0,
+  CURRENT_NOTICE_COUNT: 1,
+  CURRENT_PROMPT_PREF: "browser.displayedE10SPrompt.1",
+  PREVIOUS_PROMPT_PREF: "browser.displayedE10SPrompt",
 
   checkStatus: function() {
     let skipE10sChecks = false;
     try {
-      skipE10sChecks = Services.prefs.getBoolPref("browser.tabs.remote.autostart.disabled-because-using-a11y");
+      skipE10sChecks = (UpdateChannel.get() != "nightly") ||
+                       Services.prefs.getBoolPref("browser.tabs.remote.autostart.disabled-because-using-a11y");
     } catch(e) {}
 
     if (skipE10sChecks) {
       return;
     }
 
     if (Services.appinfo.browserTabsRemoteAutostart) {
       let notice = 0;
@@ -2311,27 +2319,36 @@ let E10SUINotification = {
         url += "?utm_source=tab&utm_campaign=e10sfeedback";
 
         win.openUILinkIn(url, "tab");
         return;
       }
 
       let e10sPromptShownCount = 0;
       try {
-        e10sPromptShownCount = Services.prefs.getIntPref("browser.displayedE10SPrompt");
+        e10sPromptShownCount = Services.prefs.getIntPref(this.CURRENT_PROMPT_PREF);
       } catch(e) {}
 
+      let isHardwareAccelerated = true;
+      try {
+        let win = RecentWindow.getMostRecentBrowserWindow();
+        let winutils = win.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
+        isHardwareAccelerated = winutils.layerManagerType != "Basic";
+      } catch (e) {}
+
       if (!Services.appinfo.inSafeMode &&
           !Services.appinfo.accessibilityEnabled &&
           !Services.appinfo.keyboardMayHaveIME &&
+          isHardwareAccelerated &&
           e10sPromptShownCount < 5) {
         Services.tm.mainThread.dispatch(() => {
           try {
             this._showE10SPrompt();
-            Services.prefs.setIntPref("browser.displayedE10SPrompt", e10sPromptShownCount + 1);
+            Services.prefs.setIntPref(this.CURRENT_PROMPT_PREF, e10sPromptShownCount + 1);
+            Services.prefs.clearUserPref(this.PREVIOUS_PROMPT_PREF);
           } catch (ex) {
             Cu.reportError("Failed to show e10s prompt: " + ex);
           }
         }, Ci.nsIThread.DISPATCH_NORMAL);
       }
     }
   },
 
@@ -2368,17 +2385,17 @@ let E10SUINotification = {
 
   _showE10SPrompt: function BG__showE10SPrompt() {
     let win = RecentWindow.getMostRecentBrowserWindow();
     if (!win)
       return;
 
     let browser = win.gBrowser.selectedBrowser;
 
-    let promptMessage = "Would you like to help us test multiprocess Nightly (e10s)? You can also enable e10s in Nightly preferences.";
+    let promptMessage = "Would you like to help us test multiprocess Nightly (e10s)? You can also enable e10s in Nightly preferences. Notable fixes:";
     let mainAction = {
       label: "Enable and Restart",
       accessKey: "E",
       callback: function () {
         Services.prefs.setBoolPref("browser.tabs.remote.autostart", true);
         Services.prefs.setBoolPref("browser.enabledE10SFromPrompt", true);
         // Restart the app
         let cancelQuit = Cc["@mozilla.org/supports-PRBool;1"].createInstance(Ci.nsISupportsPRBool);
@@ -2388,27 +2405,41 @@ let E10SUINotification = {
         Services.startup.quit(Services.startup.eAttemptQuit | Services.startup.eRestart);
       }
     };
     let secondaryActions = [
       {
         label: "No thanks",
         accessKey: "N",
         callback: function () {
-          Services.prefs.setIntPref("browser.displayedE10SPrompt", 5);
+          Services.prefs.setIntPref(E10SUINotification.CURRENT_PROMPT_PREF, 5);
         }
       }
     ];
     let options = {
       popupIconURL: "chrome://browser/skin/e10s-64@2x.png",
       learnMoreURL: "https://wiki.mozilla.org/Electrolysis",
       persistWhileVisible: true
     };
 
-    win.PopupNotifications.show(browser, "enable_e10s", promptMessage, null, mainAction, secondaryActions, options);
+    win.PopupNotifications.show(browser, "enable-e10s", promptMessage, null, mainAction, secondaryActions, options);
+
+    let highlights = [
+      "Less crashing!",
+      "Improved add-on compatibility and DevTools",
+      "PDF.js, Web Console, Spellchecking, WebRTC now work"
+    ];
+
+    let doorhangerExtraContent = win.document.getElementById("enable-e10s-notification")
+                                             .querySelector("popupnotificationcontent");
+    for (let highlight of highlights) {
+      let highlightLabel = win.document.createElement("label");
+      highlightLabel.setAttribute("value", highlight);
+      doorhangerExtraContent.appendChild(highlightLabel);
+    }
   },
 
   _warnedAboutAccessibility: false,
 
   _showE10sAccessibilityWarning: function() {
     Services.prefs.setBoolPref("browser.tabs.remote.autostart.disabled-because-using-a11y", true);
 
     if (this._warnedAboutAccessibility) {

--- a/testing/profiles/prefs_general.js
+++ b/testing/profiles/prefs_general.js
@@ -258,9 +258,9 @@ user_pref("loop.CSP","default-src 'self'
 
 // Ensure UITour won't hit the network
 user_pref("browser.uitour.pinnedTabUrl", "http://%(server)s/uitour-dummy/pinnedTab");
 user_pref("browser.uitour.url", "http://%(server)s/uitour-dummy/tour");
 
 user_pref("media.eme.enabled", true);
 
 // Don't prompt about e10s
-user_pref("browser.displayedE10SPrompt", 5);
+user_pref("browser.displayedE10SPrompt.1", 5);