Tips
How do I search?
/to open Firefox’s Quick Find (Don’t press<CR>!)<C-g>,<C-G>to jump between finds
How can I delete themes?
:unset customthemes [THEME_NAME]
Source: Tridactyl Discussions
Tricks
Hide Useless Hints (Vimium-Style Behaviour)
:bind f hint -J
Source: HackerNews
Swap Effects of J and K (Vertical Tabs)
:bind J tabnext
:bind K tabprev
(I don’t know if unbinding is necessary beforehand)