GNOME 43 is Here. What's Working, What's Not?

I’m bumping this, since it did not get a reply and I’m guessing I can’t be the only one that wants to try out of the Firefox addons, which are .xpi files. Epiphany (Gnome Web) enable WebExtension API?

This applied to Flatpak epiphany.43 in flatpak, but now we have the official 43 release and WebExpensions are still not enabled by default. How to enable?