--- a/devtools/client/framework/toolbox-process-window.js
+++ b/devtools/client/framework/toolbox-process-window.js
@@ -62,16 +62,17 @@ var connect = Task.async(function* () {
   } else {
     let response = yield gClient.getProcess();
     openToolbox({form: response.form, chrome: true});
   }
 });
 
 // Certain options should be toggled since we can assume chrome debugging here
 function setPrefDefaults() {
+  Services.prefs.setBoolPref("app.update.enabled", false);
   Services.prefs.setBoolPref("devtools.inspector.showUserAgentStyles", true);
   Services.prefs.setBoolPref("devtools.performance.ui.show-platform-data", true);
   Services.prefs.setBoolPref("devtools.inspector.showAllAnonymousContent", true);
   Services.prefs.setBoolPref("browser.dom.window.dump.enabled", true);
   Services.prefs.setBoolPref("devtools.command-button-noautohide.enabled", true);
   Services.prefs.setBoolPref("devtools.scratchpad.enabled", true);
   // Bug 1225160 - Using source maps with browser debugging can lead to a crash
   Services.prefs.setBoolPref("devtools.debugger.source-maps-enabled", false);