> Firefox can't even make basic web features like blur work on the browser
I wouldn't call backdrop-blur trivial or a basic feature. It's non-trivial to implement and used very little. Why should it be a priority?
> (that are available on even no name mobile browsers)
What no-name mobile browser that isn't based on an engine like Chromium has implemented more "basic" features than Firefox? The fact of the matter is that large corporations like Microsoft have given up trying to implement their own custom browser engine and pivoted to using Chromium.
> it doesn't support even the most basic features all other browsers have.
Like backdrop-blur?
> Fighting monopoly with an even better product that supports the ideology.
You're trivializing browser development as if you could build a better browser in a weekend.
Of the 4 major browsers developers only one isn't a billion/trillion dollar corporation; one uses it's monopoly in search to bankroll and push it's browser, one uses their monopoly position in smartphones to force their browser on users and restricts the feature set of it's browser so as not to detract from custom App development, one threw in the towel and just rebranded Chromium, and the last is a non-profit that's financially dependent on the other three for handouts.