Firefox Hack - Make Firefox 1.5 run any extension, the easy way.

At the location bar, enter: about:config. This will show you a list of Firefox internal preferences.

Right-click on the list, select New > String

Enter “app.extensions.version” (without quotes) for the preference name.

Then, enter “1.0” (without quotes) as the value for app.extensions.version.

Restart Firefox 1.5, then enable those disabled Firefox extensions.

Restart Firefox 1.5 again to active the extensions. Done.