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I've got the following problem while i'm trying to install Flashgot Addons for Firefox please help,

Firefox could not install the file at

https://addons.mozilla.org/en-US/firefo ... ddondetail

because: Unexpected installation error
Review the Error Console log for more details.
-203

Eagerly Waiting

Looks like an Add-Ons Manager corruption.

Could you try to follow the steps outlined in this article?

http://kb.mozillazine.org/Firefox_:_Iss ... sion_files