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I don't know what happened but my list of extensions does not show up on the extensions tab of the Add-ons Manager on my Firefox 12.

Is there any about:config settings to show the extensions or some fix?

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To clarify, any installed add-ons are still visible elsewhere and still work? –  iglvzx Apr 30 '12 at 0:41
    
Yes installed add-ons are still visible and they still work. To name a few, Firebug, Xmarks, WebDeveloper Tools, WebDeveloper Tools Toggle, Proxy Bonanza, FirePicker, ColorZilla, VideoHelper –  Aivan Monceller Apr 30 '12 at 8:08
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1 Answer

I have closed Firefox, then I have deleted some files from profile folder (make a backup first):

extension.ini and extension.sqlite

Restart Firefox, it will ask to reinstall every extension.

Profile folder: "%APPDATA%\Mozilla\Firefox\Profiles\profile folder"

It worked for me.

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