Why do my add-ons keep disappearing

Every week to 10 days, I open Firefox and find that all my add-ons other than Norton
have disappeared. It is getting tiresome to have to continually reinstall add-ons
I checked the profile as suggested and there is only one, a default set the day
the add-ons disappear. I am using Windows 7 home edition, and I have been using
Firefox in Sandboxie, but they disappear even in the one not sandboxed. This
has been going on for about two months

It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.json, extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
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 or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end of the Search bar to check if there is a compatibility update available.
If this hasn't helped then also delete possible addons.json and addons.sqlite files.
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[[Image:FirefoxSafeMode|width=520]]
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[[Image:Safe Mode Fx 15 - Win]]
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''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

Why do my add-ons keep disappearing

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