I love being able to easily navigate between tabs (a/J and s/K for me), go back/forward (h and l), open the current tab in a new window, close the current tab,

I love being able to easily navigate between tabs (a/J and s/K for me), go back/forward (h and l), open the current tab in a new window, close the current tab, etc. though (of course) the killer feature is "link highlighting" or whatever it's called. You can also enable "link highlighting" where selecting a link copies the URL. I also find that occasionally useful! I can't use the web without vimium.