Steps to reproduce:
In the firefox webstore @
Orion, OS version; hardware type:
Version 0.99.113.2-beta (WebKit 613.1.12), 2020 Apple M1 BacBook Air on MacOS 12 and a 2013 Thinkpad T440s Intel i5 on MacOS 11.
Here is a photo of what I expected (This is the same addon in GNU IceCat):
and what I got in Orion: