Developers, designers, and strategists, here’s something you can do for the health of the web:  Test all your sites in Firefox. Yes, we should all design to web standards to the best of our ability. Yes, we should all test our work in *every* browser and device we can. Yes, yes, of course yes.  But the health of Firefox is critical now that Chromium will be the web’s de facto rendering engine.

https://www.zeldman.com/2018/12/07/browser-diversity-starts-with-us/