I came across a neat browser extension today. It looks for "rel=me" links pointing to mastodon profiles, and puts it in a little list for you to review.

In other words, you visit a website, and if tells you if there are any mastodon accounts associated to the website.

http://streetpass.social

StreetPass for Mastodon

StreetPass: Find your people on Mastodon

@aeva Glad you like it! Big update soon 🙌 https://mastodon.social/@tvler/110135445576666001
@tvler yaay! what do you have planned :3
@aeva
- New icon currently being commissioned
- Safari extension (apple denied the current version cuz it was too similar to the official mastodon app icon lol)
- more social details (username, profile pic) for people in your StreetPass list
- export/edit your StreetPass list
@tvler I've often dreamed of something a bit similar that would discover microformats like h-card, h-event, as well as document alternates that happen to be stuff like ics, vcard, and offer to “add event to calendar" etc, so sites can more easily offer data in to PIM apps and the likes. Do you know, can a Web Extension sniff HTTP “Link:” headers for stuff like that? I feel sure it could work with in-document <link>, <a>, and microformats markup right?
@phx sounds possible!
@phx might run into issues where the client ends up downloading a ton of files trying to guess what the content type is. Unless there’s some fetch type that only returns headers and not body…. If there isn’t one then might need to spin up an API to decrease the load on the client
@tvler Oh I mean just looking at the current document open in the browser tab. What markup it contains, what Link headers it was delivered with. I wouldn't expect it to cause any more traffic?