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Firefox is running but the browser window doesn't show

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Issue on Windows 10.

Was browsing normally and Firefox went sluggish so I decided to hard reboot my computer. Now Firefox doesn't want to show up on the screen. I opened the task manager and it shows that Firefox is running. Everytime I click to open Firefox, a new background process is added and not a single browser window shows up on the screen. I reinstalled Firefox and it doesn't fix the issue. I have no issue with any other program.

Issue on Windows 10. Was browsing normally and Firefox went sluggish so I decided to hard reboot my computer. Now Firefox doesn't want to show up on the screen. I opened the task manager and it shows that Firefox is running. Everytime I click to open Firefox, a new background process is added and not a single browser window shows up on the screen. I reinstalled Firefox and it doesn't fix the issue. I have no issue with any other program.

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I had the same problem, re-create a profile and copying all data from old to new one helped me with this issue.