TypeError: _a.toLowerCase is not a function

I keep getting the below error:

over and over again (once a fraction of a second) on any page I visit when Kee extension is enabled.

“Any page” sounds a little strange. Perhaps you have another extension which is modifying every form in every page?

In any case, I expect the issue will be resolved soon. See Kee browser extension bug - using form.name rather than form.getAttribute(‘name’)