Today I had a problem with Mozilla Firefox: It would not load my add-ons. As most of the Firefox users I have been installing add-ons and customizing them, so I would hate to do it again. BTW you might want to create backup of your profile once in a while.

So the extensions (add-ons) didn’t load, but they were still present when I looked them up in Tools > Add-ons. I tried a few things, even reinstalling Firefox, but didn’t help. Then I found a great post. So what you have to do is this:

Look in your Profile Folder (see above for how to find it) and Delete these three files:
extensions.ini
extensions.cache
extensions.rdf
Make sure Firefox is not running when deleting these files. Firefox will regenerate these files on restart.

So good luck for those of you who are haveing a similar problem.