Since I am a greedy, horrible, good for nothing, twobit, cheating scoundrel, (or maybe I don't want to develop epilepsy whilst wasting bandwidth) I always install:

Yes, a lot of things on the web of 2014 2016 breaks when using these addons, and at specific pages I deem useful enough, I disable one or more of them. But for the most part, the web is a blazing fast, pretty quiet and distraction-free place for me.

I also install vimperator so that Firefox behaves like Vim.