no disable here Rated 1 out of 5 stars

i am running ff21 and this does absolutely nothing and is worthless here

Rated 5 out of 5 stars

Thanks for this addon, now i can use Firefox 2 theme reloaded for FF20.0.1.

At last I have no need to go to 'about:config' after every update Rated 5 out of 5 stars

At last I have no need to go to 'about:config' after every update.
Thank you.

Superb Rated 5 out of 5 stars

Thanks for this suberb add-on.
It makes my favorite Classic Compact theme working in FF20

Rated 4 out of 5 stars

Awesome but incomplete. In order for me to get my extension to work I needed to turn off this extension as well: extensions.checkUpdateSecurity. Otherwise 5 stars.

Rated 5 out of 5 stars

THANK YOU!! This made my favorite FT Evo Theme compatible with Firefox 19 again!! Highly recomended and 5 *

Saved my Googel Toolbar! Rated 5 out of 5 stars

Just moved from 17.xx to 18.xx and my Google Toolbar still remains functional. The best Add-On I have. Thank You!!

Rated 5 out of 5 stars


doesn't work with complete reinstalls of FF Rated 1 out of 5 stars

Maybe this checkCompatibility 1.3 add-on works with automatic internal updates of FF(?), but not with complete reinstalls...

I had it enabled in FF 18.0, uninstalled FF while keeping my personal data and settings, then installed FF 18.0.1 from "Firefox Setup 18.0.1.exe" (19,821 KB). That's my usual procedure. I don't trust the automatic internal updates which often cause problems in my experience.

My add-ons were checked for compatibility and one of them was disabled, so it didn't work (had no effect). That limitation should be made clear in the description.

Thanks for an essential fix! Rated 5 out of 5 stars

I still can't believe the Thunderbird devs think it's okay to blow up essential extensions WITHOUT EVEN ASKING. Especially since the upgrades are super-sneaky. I open my Thunderbird one day, and the calendar is gone -- poof! -- and the subject headings are back to the usual useless people send. (Stuff like "stuff," so I'd have to open every email to find out what's in it.)

Getting into about:config and setting compatibility to off for each picayune little version number gets real old, too.

Without this extension, the devs make Thunderbird just about worse than useless.

Rated 5 out of 5 stars

Thanks to this LIGHTWEIGHT addon @3.1 KB

I'm able to keep using "Screen Capture Elite" addon in FF 13 & above.

Works great Rated 5 out of 5 stars

Great extension, it lets me keep using extensions and themes that have not been updated. This has become one of my must have Firefox extensions!!

Rated 5 out of 5 stars

Fantastic, finally some much needed extensions are working again!

Rated 5 out of 5 stars

It worked, and thanks, I wasn't looking forward to going without my Tab Mix Plus for 2 months.

Rated 5 out of 5 stars

Oh my gosh, if this add-on works, it's the best one ever!!! I'm so tired of having the compatibility check disable all my add-ons. Great job!!!

Rated 5 out of 5 stars

Полезнейшее расширение, к тому же работающее и в SeaMonkey, и в Thunderbird . Снимает все проблемы с формальной несовместимостью дополнений, совершенно не мешая работе браузера. Отлично сделано, спасибо. P.S Пользуюсь не один год, и без Check Compatibility просто не могу обходиться - некоторые нужные дополнения без него установить в браузер невозможно, не прибегая к танцам с бубном.

This user has a previous review of this add-on.

Rated 5 out of 5 stars

Thank goodness this still exists. All the others that used to do this no longer do or themselves are no longer compatible.Works on FF 16.0.2

Rated 5 out of 5 stars

This is the best extension for easily preserving your addons whenever a FF update comes along. :)

Rated 5 out of 5 stars


Rated 5 out of 5 stars

Few Words. Saved my life.