QuantumVim door Shing Lyu

WARNING: This addon is till in beta, it might corrupt your data!

We recommend you use this with [QuantumVim Extra](https://cup.aihedy.com/zh-TW/firefox/addon/quantumvim-extra/)

# Supported commands
* `j`, `k`: scroll down/up by one line
* `J`, `K`: switch to previous/next tab
* `r`, `R`: reload page (`R` bypass the local web cache)
* `gg`, `G`: go to the top/bottom of the page
* `H`, `L`: back/forward in history
* `<C-f>`, `<C-b>`: scroll down/up by one page
* `<C-d>`, `<C-u>`: scroll down/up by half a page
* `y`: Copy current location
* `Y`: Copy selected text
* `d`, `D`: close the current tab and focus the left/right one.
* `f`: follow links, press <Esc> to abort.
* When focusing on an `<input>` or `<textarea>` element. It will automatically enters the INSERT MODE.
* `I`: enter INSERT MODE manually</textarea>