Bug 1571472 - use idle dispatch to start up corroborator r=bdanforth

Differential Revision: https://phabricator.services.mozilla.com/D41693

--HG--
extra : moz-landing-system : lando

browser/components/BrowserGlue.jsm

@@ -1985,10 +1985,6 @@ BrowserGlue.prototype = {
     this._monitorScreenshotsPref();
     this._monitorWebcompatReporterPref();
 
-    if (Services.prefs.getBoolPref("corroborator.enabled", true)) {
-      Corroborate.init().catch(Cu.reportError);
-    }
-
     let pService = Cc["@mozilla.org/toolkit/profile-service;1"].getService(
       Ci.nsIToolkitProfileService
     );
@@ -2141,6 +2137,12 @@ BrowserGlue.prototype = {
       TabUnloader.init();
     });
 
+    Services.tm.idleDispatchToMainThread(() => {
+      if (Services.prefs.getBoolPref("corroborator.enabled", false)) {
+        Corroborate.init().catch(Cu.reportError);
+      }
+    });
+
     // Marionette needs to be initialized as very last step
     Services.tm.idleDispatchToMainThread(() => {
       Services.obs.notifyObservers(null, "marionette-startup-requested");