It's worth mentioning that these power savings come as a result of the first of several changes that are being worked on, so more improvements are yet to come.

I know it's been a huge amount of work to move from OpenGL to Core Animation, but it's already proven to be well worth it.

IIRC Safari has the best power usage on Mac, not sure why Chrome is the only comparison.

Agreed. I've been using Safari for years because it was much more energy efficient than Chrome. I'd like to see how these numbers compare to Safari.

Yeah, the linked stats look like this brings it in line with Chrome's power consumption which is already much, much higher than Safari's.

I’m very excited to finally seriously consider switching back to Firefox full-time.

What are the main reasons for you to not use it today?

I never felt the impetus to switch back. A few years ago I used Chrome for performance, add-ons, and syncing, then I moved to OSX and use primarily Safari. When I tried firefox here the performance seemed poor so I didn't try it for long.

Amazing news. This was the bug preventing me from switching over!