Did Andreas even mention anything about extensions in Ladybird?

I hardly can imagine browsing the Internet without ublock origin or other extensions like cookie autodelete, privacy badger, ublacklist

Nothing yet. https://github.com/LadybirdBrowser/ladybird/issues/976#issue...

If you can't modify it to hell and back it's dead in the water IMO. I had to frankenstein my firefox over several weeks to get it to a usable state.