Well I was vimium/vimiumc user for long but I'm tridactyl user since today.
The ability to write in my prefered editor and then automatically paste it to browser is amazing also lot of features which other (also great extensions) don't have like running commands or other binds which are 100% great idea. The only thing I don't like out of box is tridactyl using firefox search instead of their own which take me a while to config.

Great plugin for emulating Vim key bindings, with good default bindings that work well on most websites. The bindings, behaviour, and appearance are all fully customisable, to the point that you can replicate the behaviour of many other add-ons with a couple of lines in your tridactylrc file. The current beta version now includes tab groups. The biggest drawback is that Tridactyl doesn't work on PDFs or special Firefox pages - unfortunately, this is due to FF's security features, and is true of all similar add-ons, too. The escape hatch (Ctrl+,) helps mitigate this so your flow isn't completely interrupted.

Installed right after I saw visual mode functionality, works flawlessly so far.

Utterly essential for those of use afflicted by vim keybindings. I feel brain-damaged when I use a browser without.

Love it.

Best addon for vim emulation on the browser.

It works very well, I only have one complaint: you can't close a tab or navigate tabs until a tab has loaded

Life-changing.

Great add-on for controlling Firefox with a keyboard. Also hoping to get a better start to using Vim. :D