Whataboutism isn't a particularly useful response. Firefox used to have thousands of supported extensions and allow users to install unsupported extensions. Now it doesn't, deliberately, and I would like them to reverse that decision. The fact that a more popular browser has a worse situation is irrelevant.

You can run a fork of Chromium that supports most desktop Chrome extensions: Kiwi Browser. That's not so different from having to run an unstable build (nightly) or fork (Iceraven) of Firefox.