It would be nice to have an option to choose the default invidious instance.

Can we select a default instance? Maybe return to the list through settings or if the default instance times out or isn't healthy?

Great add-on.
Two things are missing in my opinion:
1. to keep the order of the instances always the same (as some are ineffective depending on end-user location)
2. A way to add more instances

Can the dev add "invidious.fdn.fr" to the available instances?

Awsome with multiple hosts to redirect (or not)... should awsome too if I can add my own "invidious.fdn.fr" (a regex option or something)
... like :: https://addons.mozilla.org/fr/firefox/addon/invidious-redirect-2/