I would also argue that "just being better than X" was shown not to be effective in the last US Presidential election.
I would also argue that "just being better than X" was shown not to be effective in the last US Presidential election.
They're missteps, not trust breakers. Quantum was a massive step in the right direction. The Mr. Robot Easter Egg was non-malicious poor execution. I don't think it's a free pass to just contextualize how small their missteps have been in the grand scheme of things.
The reason the response seems outsized is because of the breach of trust involved, much more so than the technical impacts.
Quantum is great, and I just like a lot of the UX decisions Firefox makes. But a major reason for my support of Mozilla is their stated mission. And regularly making bumbling moves that overtly compromise that stated mission makes you start to question their commitment to it. Is it really their mission, or is it just a thing it is good for them to keep saying? POSIWID and all that.