I don't know how much different they need to be from Chrome/Chromium to not be affected (and if some built-in blocker like in Opera still will be fine), that's why I'm asking :) There is also Safari, but I would rather cook my CPU with FF than use Safari.
Basically everything except the fact that it doesn't eat huge amount of RAM. I can't stand iOS either, so not being able to sync tabs/bookmarks between my devices is probably the biggest drawback.