The Chromium fork browsers rip out Google ad-tracking, and Chromium is the de facto supported browser as a result, used by everything now from Brave to Microsoft Edge to Vivaldi to Opera and Epic and more. And Chrome plugins, useable on Chromium browsers, offer such a huge variety of useful extensions that it’s tough to discount them. I think that out of the box Firefox, Epic and Brave offer the best privacy controls as they have built-in ad-blocking, but the depth and variety of privacy extensions for Chrome/Chromium lock it down much more than any competitors, making it hard to discount.
One example: numerous websites make you load vital files through large third-party services like Google Hosted Libraries, and jQuery CDN - this lowers upkeep costs (as these services do not cost the host any money), and it speeds up the web in the sense that if you store a specific version of a file once, you will only contact that central content delivery service to see if the file your browser already has, is identical to the one that’s being served. You can’t remove them of they will often break website access. So the Decentrayeyes add-on (Chromium/Firefox) comes bundled with a number of commonly used files, and serves them locally whenever a site tries to fetch them from a delivery network. This saves bandwidth, and protects privacy.
Another: Pixelblock for Gmail (Chromium) finds, blocks and reports when it finds tracking pixels when you read your Gmail.
And then there are simply useful add-ons in Chrome that are unavailable for Safari, like ones that let you highlight text and see the font used, or get EXIF data on any image in a webpage, or lets you translate a webpage with a click, or bulk download images on a given page, or customize the look/video sizing of YouTube and block ads in the process.
And Brave is repeatedly tested as being as fast or faster than both Safari and Chrome, depending on the test.