The nerd rage is targeted at Mozilla's dishonest and incompetent managers, no? The actual dev work is top notch.
Even if it is, that kind of language doesn't help. These are all people you're talking about, trying their best to do a job they care about. Nothing gets better by your being a jerk.
I would not take that as a given for Mozilla's upper management. Many of their decisions seem to ignore what users want in deference to Google or other motivations.
Power users aren't happy that Firefox has been doing nothing but trailing Chrome for years, actively making the browser worse for power users by weakening extensions, baking ads into the browser, wilfully refusing to permit opt-out of telemetry, and lying about revenue-sharing with Pocket. [0][1][2][3][4][5][6]
Mozilla gave its CEO a raise of over $1m/year, from a starting point that was already over $1m/year, at a time when Firefox was losing usage share, while laying off engineers. Mozilla did all this while congratulating itself for putting people before profits! [7][8][9][10]
I still use Firefox as my primary desktop browser, and I really want to like Mozilla, but here we are.
(As an aside, I see Pocket is finally going to be made Free and Open Source Software, which is good news. [11])
[0] https://news.ycombinator.com/item?id=36841567
[1] https://news.ycombinator.com/item?id=24144137
[2] https://news.ycombinator.com/item?id=23391659
[3] https://news.ycombinator.com/item?id=14754740
[4] https://news.ycombinator.com/item?id=22616740
[5] https://news.ycombinator.com/item?id=10680925
[6] https://techcrunch.com/2022/11/17/mozilla-looks-to-its-next-...
[7] https://news.ycombinator.com/item?id=24569464
[8] https://news.ycombinator.com/item?id=30723971
[9] https://calpaterson.com/mozilla.html
[10] https://en.wikipedia.org/wiki/Mitchell_Baker#Negative_salary...
I would also note that "managers" runs quite a wide gamut and my experience with engineering managers at Mozilla was generally positive; upper management was not so great.