Catalog of classic Firefox add-ons created before WebExtensions apocalypse
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).
Greasemonkey is a user script manager for Firefox. (by janekptacijarabaci)
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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Ask HN: How can we help Firefox not to dissapear?
2 projects | news.ycombinator.com | 31 Oct 2023
Mimicking the Pale Moon Effect in Older Versions of Firefox
1 project | /r/palemoon | 23 Jun 2023
Best alternatives to Firefox 56.0.2?
1 project | /r/browsers | 10 Jun 2023
which has the most extensions
1 project | /r/browsers | 1 Jun 2023
How to change bookmark icons?
1 project | /r/palemoon | 26 Apr 2023