It probably will ask you to approve some of the extensions. When you start Firefox back up again, it should explore your profile folder, other folders, and the Windows registry to rebuild the list.

extensions.sqlite to something like extensions-old.sqlite (might not exist depending on how long you've been using this settings folder).

extensions.json to something like extensions-old.json.

extensions.ini to something like extensions-old.ini.

compatibility.ini to something like compatibility-old.ini.

Pause while Firefox finishes its cleanup, then rename any of these files that you find: Leaving that window open, switch back to Firefox and Exit, either:

This should launch a new window listing various files and folders in Windows Explorer.

In the first table on the page, click the 'Show Folder' button. type or paste about:support in the address bar and press Enter.(menu bar) Help > Troubleshooting Information.'3-bar' menu button > '?' button > Troubleshooting Information.Open your current Firefox settings (AKA Firefox profile) folder using either It's possible that an extensions-related settings file has become corrupted.

If you haven't already shut down and restarted Windows, you might try that in case this is a file permissions problem that sometimes occurs after Windows updates.

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