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No, it's impossible. PM doesn't support Web Extensions. You can look at the more than 200 extensions on the PM addons site, or legacy XUL addons on CAA (maybe even an older version of the one you mentioned).
It's as shklurch said, but you could try using https://github.com/janekptacijarabaci/greasemonkey/releases/tag/3.31.4Fork and a greasymonkey script: https://greasyfork.org/en/scripts?q=xkit&sort=updated
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Hence, a higher number means a more popular project.