Native Firefox shortcuts configuration not directly supported

[ToNyRANDRIAMANANTSOA]

Hello,

Thank you for this great add-on.

I think having the hotkeys configurations directly available under Firefox extensions shortcuts settings for FF users is more practical than only inside the add-on configuration page so that duplicate hotkeys can be easily spotted.

This is a screenshot of how it looks like inside Firefox extensions shortcuts settings:

Edit: Also, the hotkeys configured in the add-on preferences page are only working within the preferences page, i.e. not working in any other pages.