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My current version is 3.6.23 and most of the plug-ins and add-ons don't work anymore, and the icon has changed to a vanilla windows nondescript blot on my desktop; what's going on, and when will these anomalies be fixed?

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I know that updates can cause incompatibiulities, but this time it's especially severe. Every attempt at installation of a plug-in/add-on is met with error code -203. The fact that even the program icon cannot be found makes me wonder if my installation is corrupted (when I did the update no issues were registered). When I try to change the icon back I get, " Windows can't find the file %ProgamFiles%\Mozilla Firefox\firefox.exe.", yet under Program Files (x86) everything is there. I think the symbol %ProgramFiles% is not being initialized correctly. I'm running Windows 7, Service Pack 1, 64-bit.

I know that updates can cause incompatibiulities, but this time it's especially severe. Every attempt at installation of a plug-in/add-on is met with error code -203. The fact that even the program icon cannot be found makes me wonder if my installation is corrupted (when I did the update no issues were registered). When I try to change the icon back I get, " Windows can't find the file %ProgamFiles%\Mozilla Firefox\firefox.exe.", yet under Program Files (x86) everything is there. I think the symbol %ProgramFiles% is not being initialized correctly. I'm running Windows 7, Service Pack 1, 64-bit.