[bgdam]

But Firefox for Android originally did support the entire breadth of the addon ecosystem. When Mozilla made the quantum update they removed support for addons, and then brought back a very tiny subset. How is that not enshittification?

[majewsky]

Enshittification is entrenching your monopoly position as a platform or marketmaker in order to claw back all profits for yourself. Neither part of the definition applies: Firefox is not a platform dominating any market (they neither have the market share, nor can Mozilla force users into using Firefox through monopolies in other areas). And the users are not deprived of anything. (If you wanted, you could sideload the old Firefox for Android that supported extensions. The fact that this is a stupid idea because of security concerns is not relevant for this argument.)