Firefox BW extension has a mind of its own

On first opening with Firefox 83 in macOS Mojave, BW persists in auto-filling BW password with a different, recently generated PW. This has happened before where the fix I had used was to uninstall/reinstall the Firefox extension. What can I do to remedy this situation besides uninstalling/reinstalling the Firefox extension?

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I am also running BW on Firefox 83 on Mojave. I have never noticed this behaviour. It sounds like something specific to your system.