DNS failed for delicious.com. Shouldn't this be del.icio.us?
$ git grep delicious.com
background.js: // we also need to make sure this is OUR popup, as opposed to the live delicious.com
background.js: "*://*.delicious.com/api/v1/posts/addoredit*",
background.js: "*://*.delicious.com/api/v1/posts/delete*"
background.js: deliciousUrl = c.deliciousUrl || "https://delicious.com/save?v=5&noui&url=",
manifest.json: "http://delicious.com/*",
manifest.json: "http://feeds.delicious.com/*",
manifest.json: "*://*.delicious.com/api/v1/posts/addoredit*",
manifest.json: "*://*.delicious.com/api/v1/posts/delete*",