

Firefox’s version of MV3 explicitly supports the things that uBlock Origin needs to do. It’s not the same as Google’s malicious MV3 that was targeted at destroying adblockers.
It would be annoying if they removed MV2, but it wouldn’t break things like it did for Chromium.
My issue with snaps is also the power that Canonical has to fuck you over one day, because of the centralization that you mentioned, but also that their shitty fucking packaging format sucks ass and breaks everything but the most basic of apps. I’ve wasted hours trying to help people with their broken applications that were hijacked when they typed
apt install whatever
and “whatever” was actually a fucking broken snap package.Flatpaks and AppImages actually do the fucking things they’re supposed to. Snaps don’t, and Canonical is pulling a Microsoft by hijacking your package manager.
Also, Snap sandboxing only works with AppArmor, so if you were hoping that all the breakage was worthwhile because you get sandboxing, you don’t if you’re on anything but a handful of distros 🙂