Thank you! Some extensions might provide extra functionality which might require a very general permission to make it work, I don't know, but this one was designed to be very lightweight and simple.

I used a gray icon because I wanted the menu item to look like it was part of the browser as much as possible. Unfortunately, WebExtensions require an icon to be shown on the menus, which is the same as the extension's icon. So, unless I changed the extension's icon to a blank one, the menu option also needs to have one.