I've been a long time pentadactyl user and like other reviewers here have been evaluating a few alternatives to replace it . So far it seems like tridactyl is the only current one that approaches and has the best potential in trying to provide a pentadactyl/vimperator experience.

Being used to the maturity of pentadactyl, using tridactyl does leave me feeling a bit disabled

- tridactyl sometimes stop working on some pages and I have to switch tabs and back to get it working again
- mapping like 'gh/GH' appear to be documented but do not seem to work.
- things feel slower, e.g. my muscle memory from pentadactyl has a T + Enter to open a newtab but in tridactyl opening the commandline takes about half a second - making a few things no-ops and I have to attempt again albeit slower. :)
- tab-completion at the command line is missing. I hope this gets added.
- searching still uses the firefox native search interface (i.e. `ctrl-f`) but a feature to support this appears to be under development.
- some keybindings are different from pentadactyl - e.g. `yy` as opposed to `y` to yank the url - arguably tridactyl is doing the right thing but it does mean some investment in unlearning/remapping things.
- a lot of my custom plugins for pentdactyl don't work but as javascript support improves, things could be ported over but the docs/examples on this front are few and far between.

tridactyl is still young but has an active community/code-base and I'm sure most of my pains will go away in time. So far it looks like this is the contender I will stick with.