The "new" Firefox Mobile is a joke... they blocked thousands of extensions... Now only about 12 extensions total are available. I still use Firefox mobile v68.11.0esr even if unsupported.
Yeah, I was pissed when they did that. Though, excepting uMatrix, it has all the extensions I use daily.
I use about 15 extensions... less then half are available. Over the years Mozilla has removed many features from Firefox that I was using but this one has me looking at alternate browsers.
Also... their excuse for removing features over the years was the presence of extensions... I think that they get too much money from Google.