A lot of people even conflate Google Chrome, Google Search and other Google services (understandable, as Chrome's home page is a big Google logo with a search box), so they think that they cannot use Google anymore if they install Firefox.
The stats [1] speak for themselves: only 3.3% of users use Firefox. Even Edge has more users.
I don't know how to solve that problem, since those two outcomes are at odds with one another, but wanted to raise awareness
I can't understand why we have not seen strong regulatory/antitrust action on this front considering the precedent with MS.
The real danger to having a single codebase for the whole web is spec validation. Most web standards rely on two independent implementations. For newer technologies we could technically count WebKit and Blink as separate, but Gecko was providing an entirely separate codebase that isn't a fork of anything.
Remember how WebSQL was basically put out to pasture because it was just SQLite, warts and all, shoved inside the web sandbox? That's the sort of problem we'd rather avoid. Single-implementation standards tend to pick up bugs and misbehaviors from their implementation, since everyone winds up depending on implementation bugs rather than getting them fixed to match spec.
Yes. But adding back in Manifest v2 isn't. Even MSFT claims that it's too much work for them.