[Firefox] workaround for trigerring comment preview on GitHub

[FranklinYu]

Firefox on macOS has a keyboard shortcut Command Shift P to open a private tab. Unfortunately, this conflicts with GitHub shortcut of “show preview” for the Markdown editor, so I would have to click the tab to toggle between the editor and the preview. Not nice for Vimium users!

As far as I know, Firefox doesn’t allow add-ons (like Vimium-C) to override the built-in shortcuts, so we cannot simply “fix” it with Vimium-C. As a workaround, I found an unused combination Command Option P, and redirected it to Command Shift P, but only on GitHub. Vimium-C configuration:

env github host="https://github.com/"
map <a-m-p> runKey expect={"github":"<v-p1>"} keys="<v-p0>"
map <a-m-p:i> runKey expect={"github":"<v-p1>"} keys="<v-p0>"
map <v-p0> dispatchEvent key="p" metaKey altKey
map <v-p1> dispatchEvent key="p" metaKey shiftKey

Note that this is for macOS (as this is the only system I use). It’s easy to adapt it for other OSes.

References:

• Wiki - Map a key to different commands on different websites
• this comment for my other attempts