Ohhh, yeah, I see the problem.
But the field is not handled by our plugin, it’s added by “Yoast SEO” plugin, our plugin simply uses the value of the field.
I played with the “Yoast SEO” code a bit and figured out what’s confusing Firefox. The label for that field contains the word “username” which makes Firefox autofill that field with the value it remembers for the real username field.
Solution is basically that they change that label for that field or disable autofill for it, but for that the only approach is to contact “Yoast SEO” support.
Edit:
Or you could install Loco Translate plugin and modify that text string so it doesn’t contain “username”
But it is an issue that would affect many people so I’m sure they’ll update the plugin with the fix.
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This reply was modified 1 year, 7 months ago by WPKube.