What is the unknown symbol which covers "file" in the menu bar?
What is the unidentifiable symbol (icon?) in the upper left hand corner that covers "File" in the Menu Bar?
What is the unidentifiable symbol (icon?) in the upper left hand corner that covers "File" in the Menu Bar?
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Can you post a screenshot of the symbol?
It may be caused by an add-on, to test this use the procedure in this link - https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes