Coincidentally, it's also the best experience, for whatever reason it's the only on that supports virtual backgrounds on Linux for me? Neither Chrome nor Desktop seem to work for this.

Browser sandboxes pretty heavily though of course one does want to be a bit careful there too.

As for the rest, they may have "analytics" (spyware) but are there any documented cases of any of them acting as an X11 keyloggers or covertly screenshotting the users desktop? Those are the threats Wayland asks us to fear. And Wayland won't protect us from the rest. If Firefox or Audacity phone home with reports about what I'm doing with those applications, Wayland won't stand in the way.