How is Vimperator these days? Is it comparable to Pentadactyl? I remember switching because of some deficiency, but I don't remember exactly what.

It is absolutely comparable to Pentadactyl. I switched from Chrome to pentadactyl and then to vimperator after getting fed up with all the bugs.

http://www.wikivs.com/wiki/Pentadactyl_vs_Vimperator

I tried out Vimp because of this very thread and it's almost identical. Even the docs look the same. Which makes sense since Penta is a fork of Vimp.

Worthwhile to spend the 30 seconds installing it, typing :mkv (to create the .vimperatorrc), and copying your .pentadactylrc into it.

FF15 is feeling great and I'm glad I didn't call it quits at the lack of Pentadactyl. I'm used to FF eating a gig on my 2012 Macbook Air. Now it's sitting at less than half that for the same set of tabs.

I switched to Pentadactyl because of passkeys, but now Vimperator has ignorekeys which I think might actually be even better.