Sorry, I missed your point.
I just tried Astral.ninja and void.cat on Firefox, it seems to work fine to me. Tested on Firefox in Lineageos.
Maybe it's my environment. What didn't work exactly?
Discussion
It works good for now but just as we expect PlayStore and AppStore to ban nostr apps that undo nostr's censorship-resistance, major browsers **will in the future** mark nostr sites as dangerous.
I may be living in my bubble but do you have any past reference in your mind of browsers marking websites as dangerous? Besides certificates being expired I have never seen that so I think it is unlikely. Search engines like google though I think are more a nuisance.
This thread was in reply of an example: #[3]
Warnings like this translate into 90% less users.