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So, you use a browser that’s vulnerable to enshittification, because there’s no way to avoid this. There are only 3 companies working on browser engines, only 2 work on non-mac platforms, and both depend on advertising. Sorry you didn’t realize that.
Firefox and Chromium are open source, but virtually everybody working on them is employed by Google or Mozilla.
If you look at the changelogs and dev blogs of all the various forked versions of those projects, what you’ll see is that the devs spend basically all their time trying to keep up with all the changes coming out of Google/Mozilla and then trying to find out how to re-integrate the tweaks they’ve developed that makes their version different – which is normally just applying a skin, or a plugin, or removing something they consider a misfeature.
Oh, I wasn’t aware you’d started. You must be a terrible teacher.