Now that you know the potential causes, if Firefox does not open or launch on your Windows PC try these suggestions to fix the issue: Check the Task Manager and kill the Firefox process if open ...

Under the General category, uncheck the “Open previous windows and tabs” checkbox. That’s it. I hope this helps. Read next: Firefox not installing on Windows 11/10. Ashish holds a Bachelor's ...

Under Custom, you can either choose to enable this mode under Choose your default Windows mode or Choose your default app mode or both, depending on your preference. Then, open your Firefox ...