Fixing Broken Incompatible Extensions in Firefox

1.)  Using Nightly Tester Tools

2.) Using about:config in Firefox addressbar

 - Type about:config in Firefox addressbar and press Enter

- Now right-click and select "New -> Boolean".

Set its name in following format: extensions.checkCompatibility.version_number
ex: extensions.checkCompatibility.24.0
Now set value of this new boolean key to false.
- Again right-click and select "New -> Boolean".
Give it name extensions.checkUpdateSecurity and set its value to false.
- Restart FireFox.