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tab groups disappeared

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several times over the last few months, I have opened Firefox to find that my tab groups are gone. This seems to happen frequently after Microsoft updates have been installed, although it has happened without MS updates as well. The tab groups are an awesome feature, but having to reconstruct then every couple of weeks almost negates having them. A solution to this continuing issue would be greatly appreciated.

several times over the last few months, I have opened Firefox to find that my tab groups are gone. This seems to happen frequently after Microsoft updates have been installed, although it has happened without MS updates as well. The tab groups are an awesome feature, but having to reconstruct then every couple of weeks almost negates having them. A solution to this continuing issue would be greatly appreciated.

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Try this add-on : Session Manager add-on


thank you

Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

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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.

Make sure that you do not use "Clear Recent History" to clear the "Browsing History" when Firefox is closed because that prevails and prevents Firefox from opening tabs from the previous session.

Using "Show my windows and tabs from last time" is usually a more reliable way to restore session data.

If you use cleanup software like CCleaner then make sure that Session is unchecked in the settings for the Firefox application.