/ 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.