How to get back all my Add-ons that disappeared since I updated to firefox 13?

I've updated to FF13 and all my Add-ons disappeared and FF is returned to the default version when restarted the Web site. the disturbing part is that sometimes when I login on my system and click on FF, all my modules and themes reappear and other times when I log into the computer and launch FF, it say - appears again and I came back once more to the default version. This has happened for 2 months now and I'm tired of the situation. recently, I updated to FF 15.0 hoping things would come back normal, but it stops. What can I do to solve this problem and recover my FF custom?

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Tags: Firefox

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