Firefox 5 extension compatibility check
The old preference for disabling compatibility checks (extensions.checkCompatibility) is now gone. The new one marks the version you chose to do this at:
To re-enable your broken (but likely still working) add-ons in Firefox 5.0, add the extensions.checkCompatibility.5.0 preference in about:config:
1. Type about:config into the firefox URL bar.
2. Click I’ll be careful, I promise
3. Right-click and select New > Boolean
4. Enter extensions.checkCompatibility.5.0
5. Select false
6. Restart Firefox
06/27/11