How do I completely disable initial "Checking Compatibility of Add-ons" pop-up for all users on a Citrix server where the FireFox was upgraded to 29.0.1

I have a set of Citrix servers, we need to upgrade the FireFox on them to 29.0.1
When I have done this, and a user runs FireFox, now the users are being presented with a pop-up "Checking Compatibility of Add-ons" which delays the start of FireFox.
I need to prevent this so users just see FireFox start up without any delays.
I have installed the add-on that re-enables extensions.checkCompatibility and tried various ways of implementing it like pref("extensions.checkCompatibility", false);
However we seem to have a situation where the add-on that enables the setting is not loaded yet so the setting is not implemented.
How do I solve this for all users?

You can try to set the browser.startup.homepage_override.mstone pref to ignore on the about:config
*http://kb.mozillazine.org/browser.startup.homepage_override.mstone
You can use a mozilla.cfg file in the Firefox program folder to specify new (default) values and possibly lock prefs.
Place a local-settings.js file in the defaults\pref folder where also the channel-prefs.js file is located to specify using mozilla.cfg.
pref("general.config.filename", "mozilla.cfg");
These functions can be used in the mozilla.cfg file:
defaultPref(); // set new default value
pref(); // set pref, but allow changes in current session
lockPref(); // lock pref, disallow changes
See:
*http://kb.mozillazine.org/Locking_preferences
*http://mike.kaply.com/2012/03/16/customizing-firefox-autoconfig-files/
*http://mike.kaply.com/2014/01/08/can-firefox-do-this/

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