これでダウンロードが捗る
var url = document.head.querySelector("[property='og:image']").content;
var match = url.match(/plc:(\w+)\/(\w+)@jpeg$/);
window[.]open('https://bsky.social/xrpc/com.atproto.sync.getBlob?did=did:plc:' + match[1] + '&cid=' + match[2])

cf. github.com/mikf/gallery...

original: 1999x1999 2.37KB

feed_thumbnail: 1000x1000 267KB
cdn.bsky.app/img/feed_thu...

feed_fullsize: 2000x2000 574KB
cdn.bsky.app/img/feed_ful...

original?: 1999x1999 935KB
amanita.us-east.host.bsky.network/xrpc/com.atp...