All my modules do not work! Help, please!

Today I turned on my computer and after FireFox starts, I realized that all my modules don't work at all! When I tried to check all have been properly installed and implemented market, but anyway, I didn't see their options in the Tools menu or the contextual menu (which appears when you try to save an image, CCI). My main modules (that I use constantly) are DownThemAll, ImageHostGrabber and NetVideoHunter. None works! And when I tried to "restore my last session", he has not worked as well! (It was in FireFox 11). A coupla hours ago I installed the latest version of FireFox 17th, hoping it would help me solve the problem. Nope! There is none! And by the way, now my "Add-ons" page in the Tools menu just does not open! I already scanned my computer for the bugs and viruses (with 2 specified programs) and found nothing! So I just the hell can understand what the problem is and where it could come from! Help, please! I don't want to install GoogleChrome or any other browsers and wasting my time to import links, fix bugs and various modules, etc.!
I just need to my FireFox good old (now the most recent, in fact) works correctly and that's it!
I thank you very much in advance!

Thank you to everyone! But I found a solution easier - I saved just my FireFox to the base and then added settings on all necessary extensions. Everything works fine now! In any case, I understand your willingness to help: it's really comforting to feel that I'm not the only one!

Tags: Firefox

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