/ search interfere with built in quick search and does not work well, sometimes switching to mozilla's search while leaving addon search open, and esc do not closing addon search.
Word navigation in caret mode like w or e moving caret by one symbol forward, while b moves back by word.
Wish you could make changes to standart quick search and caret mode (f7) so it will fit nicely into gui and will not dublicate commands, but i dont know is it possible or not.
f - overlaping small font links. hard to see what they are linking to. maybe make markers smaller with shifting to empty spaces between lines.
no appearance customization.

Such a great extension. Very sane defaults. Can't imagine browsing internet without it.

A few opportunities of improvement are there though.

- Biggest of them would be able to use vimium for going to next/previous tab before the page has loaded completely. It looks like this extension requires a completely loaded page to function.

- Also to go to page's first input (gi), the first input needs to be visible. So on a scrolled down page, user needs to use (gg) first. Small annoyance

- Some sites like to autofocus one of their text fields on load. An option to disable that would be very useful.

Good vim emulation, but lacks the ability to edit text fields with vim-like commands

I cannot imagine using a browser without it.

I'm really loving it. Thanks!