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Just upgraded to latest virsion now I have none of my addons available!
I have just upgrade to the latest version of Firefox as recommended to fix security issues. Now, unfortunately, I can no longer access any of my add-on. A few of which are very important to me as I use them extensively.
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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.