Today(March 22th ’11), firefox 4 got released and if you upgraded it from 3.6 you might end up with some of the addons disabled
as they are not compatible with it untill it gets updated .
So wats the solution ? Disable the Compatibility check.
- go to about:config(type that in to your address bar and hit enter and you can see some geeky data)
- right click and add a bollean value with extensions.checkCompatibility.4.0 and set it as false
- now close firefox and restart
Bingo!! u r done