Last week, I turned on my PC, installed a Windows update, and rebooted to find Microsoft Edge automatically open with the Chrome tabs I was working on before the update. I don’t use Microsoft Edge regularly, and I have Google Chrome set as my default browser. Bleary-eyed at 9AM, it took me a moment to realize that Microsoft Edge had simply taken over where I’d left off in Chrome. I couldn’t believe my eyes.
Check out the history of WHATWG vs W3C, you might get surprised by which side Mozilla is on, or where did the code for Chromium come from.