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pinned tab won't go away

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  • Last reply by cor-el

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There is a pinned tab that shows up on start-up that I cannot get rid of. I have unpinned the tab and exited Firefox but everytime I return it shows up again. I have even removed and reinstalled Firefox.

Help. This is annoying.

There is a pinned tab that shows up on start-up that I cannot get rid of. I have unpinned the tab and exited Firefox but everytime I return it shows up again. I have even removed and reinstalled Firefox. Help. This is annoying.

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Pinned tabs are stored in sessionstore.jsonlz4 in the Firefox profile folder, so there might be a problem with this file.

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

  • rename/remove sessionstore.jsonlz4 and a possible sessionstore.js

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


If that doesn't help then check for issues caused by installed extensions.

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

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