Toolbar of downloaded add-ons not appearing in firefox
After installing add-ons from the add-ons menu, my Mozilla Firefox 19.0 browser doesn't display the toolbar associated with that add-on. Like, I downloaded 'cocoon' from the add-ons menu. Even after restarting firefox, the cocoon toolbar didn't appear. Similiar is the case with other add-ons. What should I do? Please help.
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It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) 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
- https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.
If this hasn't helped then also try to delete the addons.sqlite file.
You can also check for problems with the localstore.rdf file.