Adding instructions that you need to pin it to the toolbar for it to work. Also it would be better if it could take up two slots so the time wouldnt be squished.

Best toolbar clock!

I'm using the addon on MacOS, and I guess the only complaint I have, is due to restrictions Apple imposes on the user interface: Since the whole clock can only occupy only the space which is permitted for one single icon in the toolbar, the time HH:MM is formatted so that it fits into that tiny space. This means that "HH:" is in the top right corner of the icon space, and MM is in the top left, and the lowest pixel line of the "MM" is just outside of the space for the icon, making the minutes difficult to read.

uses the restricted firefox functionalities very well. I mean the result is just whats possible, but nonetheless worth it!

The only digital clock extension that works.

Nice and beautiful! Would be great to have some custom options like fonts, colors and size

Hours are covered by minutes.
Minimal Digital Clock is better, because hours and minutes are all displayed in badge.