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Firefox will not load anymore

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Firefox will no longer load. Task manager shows it is running, but nothing comes up on screen. All of this seemed to have started when I downloaded Thunderbird, which I have also deleted off the computer. That is the only thing I have downloaded on this computer. I have noticed a white box appears on screen, bottom right corner every time I try to open Firefox. Nothing is in the box. I have deleted and reinstalled the software. Nothing seems to work.

My system is Windows 10

Firefox will no longer load. Task manager shows it is running, but nothing comes up on screen. All of this seemed to have started when I downloaded Thunderbird, which I have also deleted off the computer. That is the only thing I have downloaded on this computer. I have noticed a white box appears on screen, bottom right corner every time I try to open Firefox. Nothing is in the box. I have deleted and reinstalled the software. Nothing seems to work. My system is Windows 10

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If you hover your mouse over the Firefox button on the Taskbar, does a thumbnail appear showing that a page has loaded? Or nothing on the Taskbar?