Prevent add-on compatibility check on 1st run

i am using a predefined prefs.js file with '''updates disabled''' and '''compatibility check false''' for add-ons as well
however each time i run firefox for the first time , i see a progress update window saying: checking comparability of add-ons
its important that i do not see this at all. any inout, anything else to look into the pref.js file?
i already have extensions.checkCompatibility.3.6 set to false and updates disabled.
odd thing is when i launch FF, i see all the correct options configured, and upon relaunch this does not happen. seems its during the first time the userprofile is launched
FF 3.6.17

that did not work
i ended up adding user_pref("extensions.update.url", ""); to my pref.js, so now when the browser launches for the first time, i see a blank window for less than 1 sec. which was an acceptable solution..
Thanks

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