When I open my Firefox browser, some of my add-ons do not appear (LastPass and Feedly, specifically). How do I fix this?
Ever since I updated to Firefox 19, I noticed that not all of my add-ons activate whenever I launch the browser, usually it's my Feedly, SuperStart, and LastPass extensions. Sometimes they do appear but most of the time they don't. I am not really sure what do I have to do to fix this.
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Please contact the support department for those add-ons as we do not regulate add-ons. Add-ons need to be regularly updated to meet with the latest version of Firefox.
I would have definitely done that if they don't work at all. But sometimes when I launch the browser, it's there. That is why I have deduced that it's not the add-ons' fault anymore but there's something about the browser that is not working properly.
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.