--- mozilla-esr17/browser/app/profile/firefox.js.disable-software-update	2012-12-01 10:24:03.000000000 +0800
+++ mozilla-esr17/browser/app/profile/firefox.js	2012-12-01 10:25:20.893792113 +0800
@@ -225,7 +225,7 @@
 pref("general.useragent.complexOverride.moodle", false); // bug 797703
 
 // At startup, check if we're the default browser and prompt user if not.
-pref("browser.shell.checkDefaultBrowser", true);
+pref("browser.shell.checkDefaultBrowser", false);
 
 // 0 = blank, 1 = home (browser.startup.homepage), 2 = last visited page, 3 = resume previous browser session
 // The behavior of option 3 is detailed at: http://wiki.mozilla.org/Session_Restore