Chromium (Google Chrome's base) is also open source.

And yet, we're still at a corporation's mercy as to whether everything Chromium-based gets ruined by Google's fuck-what-the-users-want policies. Like with Manifest V3. And JXL support. And extensions on mobile.

So is Android. So is Chromium. So is React, and Flutter. So is Java.

Open source doesn't mean FOSS.

Because people have the attention span of a goldfish and if you aren't reminding them every 5 seconds of the features they have available they'll forget they do in fact use them and then complain to support because they can't spend 5 seconds on the help page.

I say this, not in defense of mozilla, but in frustration at having to deal daily with these kinds of issues. You can put giant screen-size arrows on where to go / what single "do the thing" button to press and people will still forget 5 seconds later.

We're so fucking used to ads we don't even always realize we're getting pushed propaganda

But they haven't threatened to undercut ad blocking yet, so as a comparison they are better.

You forgot to also mention that they are a cult where you get attacked if you say anything negative about Mozilla.