https://play.google.com/store/apps/details?id=org.mozilla.fi...
(I have already tried it)
I had terrible battery problems on a moto g2 about a year ago which is what I'm basing my opinion on so that may be invalid now.
You'd have to prize Firefox and uBlock (on my first gen Moto G) out of my cold dead hands.
I browsed The Verge site just fine. (The images took a little longer to load than I expected, but I checked and same happens on the desktop. So it's a shitty ISP/CDN/Optimization problem rather than a browser one.)
[1] http://blog.lmorchard.com/2015/07/22/the-verge-web-sucks/
That said, it can be browsed well on Chrome, so it should work on Fx as well.
I noticed a great difference on my 2011 Google Nexus 3 between adblock and uBlock Origin, in terms of memory usage.