I switched to Quantum as my daily driver a few weeks ago, I love it as a user. It has made me hate the Chrome dev tools with white hot passion. Firebug might be gone, but the new dev tools are a masterpiece of usability. I emphatically recommend developer edition as a development browser.
Yeah, the new devtools are pretty nice! The revamp is missing some bits (e.g. the pretty printer is missing for files without a sourcemap) but I suspect that will trickle through slowly.
I've noticed that a lot of folks don't realize there are a bunch more devtools tabs that you can enable hidden in the settings (including a shader editor, a canvas debugger, and a DOM inspector). They're less useful than the main four (inspector/console/debugger/network) but are pretty neat and help a lot.
