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Since Windows 10 upgrade Firefox won't open, I'm able to execute it but the window won't maximize (I can see the small image when hovering over the taskbar)

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Since Windows 10 upgrade Firefox won't open, I'm able to execute it but the window won't maximize (I can see the small image when hovering over the taskbar). I also remember that Firefox worked shortly after the upgrade for like a month but started to get slower. Also the last times it worked, it started to crash after startup and I had to kill the default startup page.

Since Windows 10 upgrade Firefox won't open, I'm able to execute it but the window won't maximize (I can see the small image when hovering over the taskbar). I also remember that Firefox worked shortly after the upgrade for like a month but started to get slower. Also the last times it worked, it started to crash after startup and I had to kill the default startup page.

Additional System Details

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36

More Information

FredMcD
  • Top 10 Contributor
4223 solutions 58930 answers
You may have a corrupt '''xulstore.json''' file. '''https://support.mozilla.org/en-US/kb/changes-toolbars-and-window-sizes-are-not-saved'''