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Firefox opens with huge number of tabs whose access brings Firefox to a halt

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When Firefox is launched on my Mac desktop, it takes a long time to display a browser window, and the window is filled with innumerable tabs whose origins I can't understand. I have tried many of the remedies suggested for dealing with too many tabs, and none seem to work. I trashed the Firefox application and the folder /User/Library/Application_Support/Firefox, restarted the Mac, and Firefox works well for a while, but when I do a Google Search the browser window is suddenly populated with huge numbers of tabs that seem similar to what I have seen in past occasions, and Firefox stalls. Are there some other files containing a record of all these tabs that I can delete, to stop this from happening?

I can't "Refresh Firefox", because Firefox is unusable at the point when the problem occurs.

When Firefox is launched on my Mac desktop, it takes a long time to display a browser window, and the window is filled with innumerable tabs whose origins I can't understand. I have tried many of the remedies suggested for dealing with too many tabs, and none seem to work. I trashed the Firefox application and the folder /User/Library/Application_Support/Firefox, restarted the Mac, and Firefox works well for a while, but when I do a Google Search the browser window is suddenly populated with huge numbers of tabs that seem similar to what I have seen in past occasions, and Firefox stalls. Are there some other files containing a record of all these tabs that I can delete, to stop this from happening? I can't "Refresh Firefox", because Firefox is unusable at the point when the problem occurs.

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You can check that those pages aren't set as multiple homepages.

You can check the homepage setting.

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.

  • delete sessionstore.jsonlz4 and sessionstore.js

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

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Valgt løsning

You can check that those pages aren't set as multiple homepages.

You can check the homepage setting.

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.

  • delete sessionstore.jsonlz4 and sessionstore.js

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