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I had several tab groups in use but when I restarted my computer, only one tab group relaunched. What did I do wrong?

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Before I restarted my computer (Mac) I clicked Bookmark All Tabs. I thought this would save ALL my tabs on ALL of my Tab Groups. But after my computer was restarted I only found one tab group. What do I have to do to save ALL tabs in ALL tab groups?

Before I restarted my computer (Mac) I clicked Bookmark All Tabs. I thought this would save ALL my tabs on ALL of my Tab Groups. But after my computer was restarted I only found one tab group. What do I have to do to save ALL tabs in ALL tab groups?

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Did you add extra tab groups?

App (pinned) tabs and Tab Groups (Panorama) are stored as part of the session data in the file sessionstore.js in the Firefox profile folder.

If not all tab groups are saved the it is possible that there is a problem with the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.

Delete the files sessionstore.js and sessionstore.bak in the Firefox Profile Folder.

If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.
Deleting sessionstore.js will cause App Tabs and Tab Groups to get lost, so you will have to create them again (make a note).

See:

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>>>Did you add extra tab groups?<<< Yes, I was using multiple tab groups but only one of them appeared after I restarted my computer. I didn't understand the rest of your reply. Sorry.

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If you lose newly added tab groups then there may be a problem with the file sessionstore.js that stores that configuration. If that file doesn't get updated then you get a previous configuration. In that case you need to remove that corrupted file (see my above post) and try again to create the tab groups.

You can go to the Firefox Profile Folder this way: