Hello, encountered this with McAfee Total Protection and Firefox 81.0b7 under Windows 7. There was no addon installed in Firefox, and reinstalling both the AV software and Firefox didn't help.
Bug 1645341 Comment 9 Edit History
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Hello, encountered this with McAfee Total Protection (16.0 R25) and Firefox 81.0b7 under Windows 7. There was no addon installed in Firefox, and reinstalling both the AV software and Firefox didn't help.