[vetinari]

I'm also using Firefox on Android (because it is the only mobile browser that supports extensions).

However, the desktop Firefox regularly tops my 'Apps using significant energy' list, even when idling.

[epmatsw]

Fwiw, the significant energy usage list on OSX corresponds pretty poorly with real world results. Safari is the most efficient, and Firefox is actually slightly better than Chrome.

What does the OS X Activity Monitor’s “Energy Impact” actually measure? | Nicholas Nethercote https://blog.mozilla.org/nnethercote/2015/08/26/what-does-th...

Chrome vs Safari vs Firefox web browser efficiency http://blog.getbatterybox.com/which-browser-is-the-most-ener...

[vetinari]

Thanks for the links, especially the Nicholas Nethercotes' blog is very interesting.

To be fair, Google is working on the Chrome efficiency: https://plus.google.com/+PeterKasting/posts/GpL63A1K2TF