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I used vimium on Chrome for years and since web extensions became available on Firefox have started using it there too. Gets my vote.

Lack of Vimium stopped me from even attempting to switch back from Chrome to Firefox.

Can't live without Vimium.

Did you not know that the old Firefox had much more functional vim emulation add ons?

I think it's unfair to describe Vimium as less functional. They do less but they do it well with a modern looking UI.