Are you perhaps referring to Pentadactyl[1]? I'm a huge fan of it.
Re:My biggest problem with Vim
by dredmorbius on Friday August 10, 2012 @04:31PM
(#4368100)
Thanks, yes. I'd seen it referenced here, haven't used it.
Vimperator still works on my somewhat age'd 14.0 FF.
History made marvelously easy. This alone sold me on the extension.