And since you won’t be able to modify web pages, it will also mean the end of customization, either for looks (ie. DarkReader, Stylus), conveniance (ie. Tampermonkey) or accessibility.
The community feedback is… interesting to say the least.
In addition to what the other commenter said, Mozilla doesn’t have the will to improve Firefox into a market contender.
They get a lot of free money from their competitors to prevent legislations from attacking chromium for market monopoly which makes them prioritize making Google happy more than their users.
They also have very controversial opinions regarding actual useful features such as progressive web apps (where support was given exclusively on Android but after a lot of complains). You can’t make your browser into a market contender if you act like Safari on PC.
10 years ago when we had a 3 way market, Mozilla actually cared about making a good product.
Nowadays, they are just Google’s shell company to keep Chrome’s dominance away from the anti-competivity law suits.