Clip url wót Vogu66

Copy the current page url directly from the address bar, which was disabled in Firefox 89.

Permissions required:
* Access to the clipboard to copy the URL

A nice and simple add-on.

Icon credit: https://www.iconfinder.com/iconsets/multimedia-75 (Sergey Ershov)
Source code: https://github.com/vogu66/firefox-clip-url