I'm really liking this recent uptick in Google/Mozilla/Opera development/rivalry lately. It's good for consumers. If only things happened more quickly...
I would say though Firefox does remain a strong (if the last) holdout.
Canvas debugger: https://webkit.org/blog/8452/canvas-debugging/
Flexbox inspector: https://developer.mozilla.org/en-US/docs/Tools/Page_Inspecto...
Fonts tab: https://developer.mozilla.org/en-US/docs/Tools/Page_Inspecto...
> everything moving to Chromium... [including] Safari
This is the opposite of true
FWIW, the assumption that safari and some random WebKit browser will behave the same seems unsafe to me. The release version of safari will probably be on a newer/older WebKit edition and stuff like tracking protection might behave differently.