FF add-on to change browser UA for specific sites

Years ago I used a classic Firefox extension called UAcontrol . It allowed me to set specific user agent strings for specific URls. I’m looking for something similar that will work with modern FF.
So basically, I want the browser normal UA reported for most sites, but want different specific UA strings for several sites. The closest I could find was User-Agent Switcher and Manager, but it isn’t even close to what I want.
Any other suggestions?

Yeah, it's hit and miss with good extensions that were developed for the older Firefox that used XUL code instead of this crap code they use now which I can't remember it's name now. All I know is that the code used now is vulnerable to exploits.

I tried to find a good UA extension for Firefox and really couldn't find anything that was like the UA add-on I had before. Currently, my main driver is Pale Moon that still uses the tried and true XUL code so I still use UAControl I had in Firefox years ago.