Bug 1457224 Enable delayed background page startup on Nightly r=zombie

MozReview-Commit-ID: 8xzBLmQRIL6

--HG--
extra : rebase_source : 1a3182b395416c30ff27873e6539501c80d9a43b
extra : histedit_source : 6945649dab3c354542220c8fc81f4f1347dcb353

browser/app/profile/firefox.js

@@ -80,6 +80,10 @@ pref("extensions.webextensions.default-content-security-policy", "script-src 'se
 pref("extensions.webextensions.remote", true);
 #endif
 
+#ifdef NIGHTLY_BUILD
+pref("extensions.webextensions.background-delayed-startup", true);
+#endif
+
 // Extensions that should not be flagged as legacy in about:addons
 pref("extensions.legacy.exceptions", "testpilot@cliqz.com,@testpilot-containers,jid1-NeEaf3sAHdKHPA@jetpack,@activity-streams,pulse@mozilla.com,@testpilot-addon,@min-vid,tabcentertest1@mozilla.com,snoozetabs@mozilla.com,speaktome@mozilla.com,hoverpad@mozilla.com");
 

toolkit/components/extensions/test/xpcshell/test_ext_permissions.js

@@ -11,6 +11,8 @@ AddonTestUtils.init(this);
 AddonTestUtils.overrideCertDB();
 AddonTestUtils.createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "42");
 
+Services.prefs.setBoolPref("extensions.webextensions.background-delayed-startup", false);
+
 let extensionHandlers = new WeakSet();
 
 function frameScript() {

toolkit/components/extensions/test/xpcshell/test_ext_startup_cache.js

@@ -9,6 +9,8 @@ AddonTestUtils.overrideCertDB();
 
 AddonTestUtils.createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "42");
 
+Services.prefs.setBoolPref("extensions.webextensions.background-delayed-startup", false);
+
 const ADDON_ID = "test-startup-cache@xpcshell.mozilla.org";
 
 function makeExtension(opts) {