[grahamf]

This is literally the only reason why I'm unable to make the switch, as some of the sites I go to have video and animated ads that kill my battery - so I have to run Firefox with uBlock.

thanks

[milkyway]

If you are into hacking it's possible for x20, x30 and x40 Lumias.
Otherwise you could use "Momentum Browser" which is a (light) ad blocker built in

[Kot Prada]

I do not use them even on PC, cause they always lead to some lags here and there.

[xandros9]

Nope, I wouldn't expect it.

I'd keep your Firefox and uBlock, keeps it easy.