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FireFox opens new tab in different window

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I started having problems when I upgraded to FireFox 4. First, I had several windows open when FF locked up. I had to close it from the task manager. When I restarted FF, not all the windows re-opened.

Secondly, I started having a problem when I click on "open in new tab" that the new tab gets opened in one of the other open windows.

I started having problems when I upgraded to FireFox 4. First, I had several windows open when FF locked up. I had to close it from the task manager. When I restarted FF, not all the windows re-opened. Secondly, I started having a problem when I click on "open in new tab" that the new tab gets opened in one of the other open windows.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Appearance/Themes).

  • Don't make any changes on the Safe mode start window.

See:


This can also be a problem with the files sessionstore.js and sessionstore.bak in the Profile Folder

Delete sessionstore.js and sessionstore.bak in the Profile Folder

  • Help > Troubleshooting Information > Profile Directory: Open Containing Folder

If you see files sessionstore-##.js with a number in the left part of the name like sessionstore-1.js then delete those as well.

You will have to redo App Tabs and Tab Groups after deleting sessionstore.js.

See: