Hi...
When updating to the latest version of FF3 B5, portable style, as described here: https://portableapps.com/node/12311 I often at first-time-startup/opening get this window: http://img139.imageshack.us/img139/752/autoupdatelw2.png
If your not fast enough (I wasn't the first time, but now I'm always aware) to press the 'cancel', then when Firefox opens, all your extensions not compatible will be disabled. Son of a Bitch! 
(sorry, but this is really annoying)
That's even though that I before updating to the latest trunk, portable style, I had made the two booleans: 'extensions.checkCompatibility' set it to 'false' and 'extensions.checkUpdateSecurity' set to 'false'. The smart thing about this, in the top first link described way of updating, is that all your extensions and modifications are still there. But if you aren't quick enough to disable the "Checking Compatibility of Add-ons" on first-time-startup/opening, then it automatically resets those two booleans...
Are there any kind of way to prevent this "Checking Compatibility of Add-ons" on first-time-startup/opening from coming? have looked in about:config, but can't find anything obvious...
Would really be lovely if there was some kind of way to prevent this from coming...
Thanks
P.S. In the image, it may seems that one have a lot of time to press 'cancel', but in fact you only have about 2 seconds, before it has auto-checked and started up having disabled your add-ons (It is just me who was quick to press 'Prt Scr' (Print Screen))
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The "Nightly Tester Tools" extension has options
to disable the check, disable overwriting during update and
to " make extensions compatible" maybe that does the trick ?
https://addons.mozilla.org/addon/6543
http://www.oxymoronical.com/web/firefox/nightly
The Nightly Tester Tools, in reality only does the same thing as this:
1. Type 'about:config' in locationbar
2. Make a new 'boolean' called 'extensions.checkCompatibility' and toggle it to 'false'
3. Make a new 'boolean' called 'extensions.checkUpdateSecurity' and toggle it to 'false'
= It makes you able to use extensions not having support for your FF version.
It doesn't stop the 'Annoying Auto "Checking Compatibility of Add-ons" update' from coming
In addition I can say that I once back decided to "boycott" the 'Nightly Tester Tools' extension as using it resulted in some problem (I can't remember it anymore). The about:config tweaks doesn't result in that, and also I don't want to have a extension installed if what it does can easily be done without it.
Buttomline: 'Nightly Tester Tools' doesn't fix my problem