It reminds me of a story that made the news[0] some years ago.

The local police received complaints that a dog was being mistreated, chained on the same spot for days.

Arriving at the scene they found out that an elderly couple were using a Rottweiler statue for keeping burglars away from their house.

OP's fake dog is a great improvement over that one!

[0] https://g1.globo.com/mg/sul-de-minas/noticia/2019/05/09/pm-e...

A dog was mistaken for a lion: https://abcnews.go.com/blogs/headlines/2013/01/labradoodle-m...

I had the same experience.

I clicked the continue button, but in the following screen clicking the "grant permission" button didn't do anything.

I uninstalled and reinstalled the extension, same thing. But this time resizing or moving the browser window showed the Firefox Addon prompt that should have been shown previously, but not long enough for clicking it. I was using Firefox under Wayland.

I tried a third time, now using Firefox under XWayland, and this time the prompt was correctly shown.