Bug 1069640 - Prompt for input when users turn off e10s in Nightly. r=billm

browser/components/nsBrowserGlue.js

@@ -2276,6 +2276,25 @@ let E10SUINotification = {
         this._showE10sAccessibilityWarning();
       }
     } else {
+      let displayFeedbackRequest = false;
+      try {
+        displayFeedbackRequest = Services.prefs.getBoolPref("browser.requestE10sFeedback");
+      } catch (e) {}
+
+      if (displayFeedbackRequest) {
+        let win = RecentWindow.getMostRecentBrowserWindow();
+        if (!win) {
+          return;
+        }
+
+        Services.prefs.clearUserPref("browser.requestE10sFeedback");
+        let url = Services.urlFormatter.formatURLPref("app.feedback.baseURL");
+        url += "?utm_source=tab&utm_campaign=e10sfeedback";
+
+        win.openUILinkIn(url, "tab");
+        return;
+      }
+
       let e10sPromptShownCount = 0;
       try {
         e10sPromptShownCount = Services.prefs.getIntPref("browser.displayedE10SPrompt");

browser/components/preferences/in-content/main.js

@@ -141,6 +141,10 @@ var gMainPane = {
         for (let prefToChange of prefsToChange) {
           prefToChange.value = e10sCheckbox.checked;
         }
+        if (!e10sCheckbox.checked) {
+          Services.prefs.setBoolPref("browser.requestE10sFeedback", true);
+          Services.prompt.alert(window, brandName, "After restart, a tab will open to input.mozilla.org where you can provide us feedback about your e10s experience.");
+        }
         Services.startup.quit(Ci.nsIAppStartup.eAttemptQuit |  Ci.nsIAppStartup.eRestart);
       }
     }