Firefox has started to crash at startup, after that I seconded a bookmark bar button

Firefox has started crashign at startup after I seconded a button in the bookmarks bar. It does not start in SafeMode either.

This looks like a problem with the taskbar previews.

It is possible that there is a problem with the sessionstore.js and sessionstore.bak files in the Firefox profile folder.

Delete the sessionstore.js file [2] and files possible sessionstore-# .js [3] with a number and sessionstore.bak in the Firefox profile folder.

Delete sessionstore.js will cause App Tabs and tab groups and opened and closed the tabs (back) to get lost, so you will need to create them again (take note or bookmarks).

See also:

Create a new profile as a test to see if your profile is the source of the problems.

See "basic troubleshooting: a new profile:

There may be extensions and plugins installed by default in a new profile, so check that in "tools > Modules > Extensions & Plugins" in case there are still problems.

If this new profile works then you can transfer files from the old profile to the new profile, but make sure not to copy corrupted files.

See:

Tags: Firefox

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