My extensions have stopped working. They appear in the Add-on list as installed, but they don't load with Firefox.
I have many extensions downloaded. They all worked earlier today, but now none of them are working. They appear in the add-on list as installed, but they don't load. I cannot find them anywhere in any Tools or Options. I use Speed Dial, Read It Later, etc., and they're all gone.
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You can delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini, extensions.sqlite) and compatibility.ini in the Firefox profile folder to reset the extensions registry. New files will be created when required.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
If you see disabled extensions that are not compatible on the next start in "Tools > Add-ons > Extensions" then click the "Find Updates" button to do a compatibility check.