Error Console log for more details. -203

[txgirlingeorgia]

Firefox could not install the file at

https://addons.mozilla.org/en-US/firefo ... 3.5-fx.xpi

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


i keep getting this message, can someone help me??????????????

[LoudNoise]

From the KB

Files that store information about the extensions you have installed can sometimes be corrupted. Deleting them can fix a number of extension issues; they will be regenerated the next time you start Firefox. . Exit Firefox completely, then open your Firefox profile folder (read the linked article for its location) and delete* these three files:

extensions.ini
extensions.cache
extensions.rdf

Also delete compatibility.ini (thanks steviex)

To find your profile:
http://kb.mozillazine.org/Profile_folder_-_Firefox