Recent answers to pinned tab won't go awayhttps://support.mozilla.org/ar/questions/13912462022-09-30T10:24:54-07:00Pinned tabs are stored in sessionstore.jsonlz4 in the Firefox profile folder, so there might be a pr2022-09-30T10:24:54-07:00cor-elhttps://support.mozilla.org/ar/questions/1391246#answer-1537690<p>Pinned tabs are stored in sessionstore.jsonlz4 in the Firefox profile folder, so there might be a problem with this file.
</p><p>You can check for problems with the sessionstore.jsonlz4 file in the Firefox profile folder that stores session data.
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<ul><li>rename/remove sessionstore.jsonlz4 and a possible sessionstore.js
</li></ul>
<p>You may also have to rename the sessionstore-backups folder.
</p><p>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.
</p><p>You can use the button on the "Help -&gt; More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the <b>about:profiles</b> page (Root directory).
</p>
<ul><li>Help -&gt; More Troubleshooting Information -&gt; Profile Folder/Directory:<br>Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
</li><li><a href="https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data" rel="nofollow">https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data</a>
</li></ul>
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<p>If that doesn't help then check for issues caused by installed extensions.
</p><p>Start Firefox in <b>Troubleshoot Mode</b> to check if one of the extensions ("3-bar" menu button or Tools -&gt; Add-ons -&gt; Extensions) or if <b>hardware acceleration</b> or <b>userChrome.css</b> is causing the problem.
</p>
<ul><li>switch to the DEFAULT theme: "3-bar" menu button or Tools -&gt; Add-ons -&gt; Themes
</li><li>do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window
</li></ul>
<ul><li><a href="https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode" rel="nofollow">https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode</a>
</li><li><a href="https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems" rel="nofollow">https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems</a>
</li></ul>