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Opens in Mulitple Windows

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  • 1 has this problem
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  • Last reply by cor-el

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Hi Folks All of a sudden, Firefox started opening multiple windows when I try to open new tab. Even after quitting--when first opening--multiple windows appear! Help

Hi Folks All of a sudden, Firefox started opening multiple windows when I try to open new tab. Even after quitting--when first opening--multiple windows appear! Help

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is this when you are trying to open a blank page or when selecting a link?

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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

  • rename/remove sessionstore.jsonlz4 and 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 -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.


You can check the homepage setting.

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

You can create a new profile as a quick test to see if your current profile is causing the problem.

See "Creating a profile":

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.