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When ever I open Firefox browser around ten old tabs are there. I close them and they come back, always

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When I open Firefox browser around ten several weeks old tabs are there. It is not set in the setting to open. I did many attempts to get rid of this nuisance and they are still here. I Created new profile, erased all profiles, removed Firefox, and reinstalled with option not to use old setting since new installation found that the fire fox has been installed. And frustration part that Mozilla do not offer (as I know) support to fix this problem. This glitch is hidden somewhere and the program always find it an put it back. I am not sure if what to do as I run out of options, other than turn to another browser after many years using only Firefox with no problems at all. Thanks Ned

When I open Firefox browser around ten several weeks old tabs are there. It is not set in the setting to open. I did many attempts to get rid of this nuisance and they are still here. I Created new profile, erased all profiles, removed Firefox, and reinstalled with option not to use old setting since new installation found that the fire fox has been installed. And frustration part that Mozilla do not offer (as I know) support to fix this problem. This glitch is hidden somewhere and the program always find it an put it back. I am not sure if what to do as I run out of options, other than turn to another browser after many years using only Firefox with no problems at all. Thanks Ned
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You can check that those pages aren't set as multiple homepages.

You can check the homepage setting in "Settings -> Home".

Firefox supports multiple homepages separated by '|' (pipe) symbols.

You can check for problems with the sessionstore.jsonlz4 file in the Firefox profile folder that stores session data.

  • rename/remove sessionstore.jsonlz4

You may also have to rename the sessionstore-backups folder.

When sessionstore.jsonlz4 is deleted you lose pinned-tabs and open tabs and you will have to recreate them, so if necessary make a note or bookmark them. sessionstore.jsonlz4 is only present in the Firefox profile folder when Firefox is closed.

You can use the button in "Help -> More Troubleshooting Information" (about:support) to go to the current Firefox profile folder or use the about:profiles page (Root directory).