You can pretty easily check how private and secure a browser is; setting up a "man in the middle" to monitor its communication is something we do routinely at B

You can pretty easily check how private and secure a browser is; setting up a "man in the middle" to monitor its communication is something we do routinely at Brave (see https://brave.com/popular-browsers-first-run/ https://brave.com/popular-browsers-first-run/), and what others have done as well (see https://www.scss.tcd.ie/Doug.Leith/pubs/browser_privacy.pdf https://www.scss.tcd.ie/Doug.Leith/pubs/browser_privacy.pdf).