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Since installing Firefox 4 Beta 5, the Add-Ons manager is empty. My add-ons still appear to be installed and working, but I can't install more, or uninstall, or configure them.

  • 3 replies
  • 100 have this problem
  • 274 views
  • Last reply by atsushieno

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My add-ons still appear to be installed and working, but I can't install more, or uninstall, or configure them.

Chosen solution

Try forcing Firefox to rebuild the list of installed add-ons.

  1. Open the profile folder, for details of how to access it see the Profiles - Where Firefox stores your bookmarks, passwords and other user data article.
  2. Close Firefox, then delete extensions.sqlite (you can also delete extensions.cache, extensions.ini, extensions.rdf if they exist)

When you restart Firefox the list of installed add-ons should be rebuilt.

If that did not work, you may have an add-on that is causing the problem, try the options in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article.

If you type about:addons into the location bar does that bring up the list of add-ons? I have seen a blank add-ons list if Mr Tech Toolkit add-on is installed, accessing the add-ons manager by typing about:addons in the location bar is a workaround with that add-on installed. The author of that add-on is working on an update.

Read this answer in context 👍 5

All Replies (3)

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Chosen Solution

Try forcing Firefox to rebuild the list of installed add-ons.

  1. Open the profile folder, for details of how to access it see the Profiles - Where Firefox stores your bookmarks, passwords and other user data article.
  2. Close Firefox, then delete extensions.sqlite (you can also delete extensions.cache, extensions.ini, extensions.rdf if they exist)

When you restart Firefox the list of installed add-ons should be rebuilt.

If that did not work, you may have an add-on that is causing the problem, try the options in the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article.

If you type about:addons into the location bar does that bring up the list of add-ons? I have seen a blank add-ons list if Mr Tech Toolkit add-on is installed, accessing the add-ons manager by typing about:addons in the location bar is a workaround with that add-on installed. The author of that add-on is working on an update.

Modified by TonyE

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I could see the addons when I used about:addons.

I removed MR Tech Toolkit and all is well.

THANKS! :D

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In my case, disabling Echofon, which was installed when I was using 3.6, fixed it (ran safe mode, disabled all addons, and tried enabling each one). I was using 4.0 beta7.