You can just manually install the official Firefox linux release. I've always done this since the Debian Iceweasel days and it works without issue.
For example, Fedora build is ruled by these principles: https://pagure.io/fesco/issue/1518, while the Mozilla build is not.
You need your tools goals to be aligned with your own, and reject any that aren't, not cater to them.
Working around the FF package by installing from elsewhere is no answer.