One of the bad things about fediverse handles is that if you put them on a web page, they are not immediately clickable. And even the convention @foo@bar.com -> https://bar.com/@foo is a Mastodon-only convention I believe; really needs a Webfinger lookup to resolve to something a browser can open.
What if browsers started handling the acct: scheme by doing the Webfinger lookup?
@J12t
Considering #mozilla is going all in on #fediverse, this might start there, or it might only work on their instance.