While 15 years ago I was 100% behind Mozilla, as they struggle to remain relevant, their mission to support open source software and to not resort to shady business practices as a cash grab seems to have withered and died.

Probably the most obnoxious things that Firefox is doing today are:

Telemetry and Experiments: On by default your browser is reporting information about you to Mozilla. While many browsers do this, I don't think it's okay. Mozilla justifies it by saying that they need this information in order to profile performance problems and fix bugs. However, it sends an enormous amount of data about the user which could easily be de-anonymized later.

While Experiments lets Mozilla turn on things that may not work right yet, and which can change how your browser works in mysterious ways that can cause problems.

You can turn these off, but Mozilla doesn't do enough to make them "opt-in". It just hangs a banner notification saying "Hey this is happening."

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Firefox Sync: While there's nothing wrong with Sync, Firefox is a US company that is subject to some of the worst privacy laws in the western world. With nothing more than your Sync password, which they have, they can turn over your browsing history, bookmarks, site logins, and more to the police, and then be hit with a gag order making it illegal for them to tell you that the government did that.

That's not even considering the possibility of a data breach.

While you don't have to turn it on, it strongly suggests you do.

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"Sponsored Stories": In an attempt to make up for sagging search royalties attributable to their decline in market share, Mozilla has resorted to letting companies buy ads that pretend to be news articles, and stuffs them in the New Tab page.

In one case, I was directed to the New York Times, which had let Exxon Mobil buy a full page ad that looked like a story, suggesting that climate change isn't real.

You can turn this off, but why should you have to? A year after its introduction, Mozilla's revenue fell another 14%.
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Sorry Firefox, but after all these years, it's time for you to go away. You no longer represent the ideals that you claim to say you do.

Things really came to a head this month when you fired 70 of your best and smartest engineers (who were immediately snapped up by Apple and Google), so that you could keep a $4 million dollar a year CEO and bunch of dead weight SJWs like your Global Chief Diversity Officer, during a budget crisis.

There were a number of things you could do to keep most of those people on, but you chose poorly.

You're going to lose all of the people who value open source and software that doesn't get in the way and piss them off to Brave.

sudo dnf remove firefox