I am consistently disappointed by any thread involving Mozilla on Hacker News. Somehow Mozilla is held to an impossible standard. For the one company out there holding the internet away from a WebKit monoculture, they sure get the short end of the stick by people here.
Firefox development itself has been rudderless and lethargic for a long time. WebKit introduced backdrop filters 7 years ago and Firefox is still working on implementing them. [1]
I don't think that's a particularly high standard. The CEO is a failure and the board is incompetent for not firing her years ago.
[1] https://webkit.org/blog/3632/introducing-backdrop-filters/