Ignore professed short URLs after AJAX tomfoolery.

common/modules/buffer.jsm

@@ -256,6 +256,16 @@ var Buffer = Module("Buffer", {
      */
     get uri() util.newURI(this.win.location.href),
 
+    /**
+     * @property {nsIURI} The current top-level document's URI, sans
+     *  fragment ID.
+     */
+    get pageURI() {
+        let uri = this.uri;
+        uri.ref = "";
+        return uri;
+    },
+
     /**
      * @property {nsIURI} The current top-level document's URI, sans any
      *     fragment identifier.
@@ -702,8 +712,17 @@ var Buffer = Module("Buffer", {
                 util.reportError(e);
             }
 
+        let sane = link => {
+            let a = [link.href, this.pageURI.spec];
+            let b = overlay.getData(link, "link-check");
+            return !b
+                || a[0] == b[0] && a[1] == b[1]
+                || a[0] != b[0] && a[1] != b[1];
+        }
+
         let link = DOM("link[href][rev=canonical], \
                         link[href][rel=shortlink]", doc)
+                       .filter(sane)
                        .attr("href");
         if (link)
             return hashify(link);
@@ -711,6 +730,19 @@ var Buffer = Module("Buffer", {
         return null;
     },
 
+    locationChanged: function locationChanged() {
+        // Store current URL to detect tomfoolery. Might go awry if
+        // links get updated before `history.pushState`, but better safe
+        // than whatever.
+
+        DOM("link[href][rev=canonical], \
+             link[href][rel=shortlink]", this.doc)
+            .each(elem => {
+                overlay.getData(elem, "link-check",
+                                () => [elem.href, this.pageURI.spec])
+            });
+    },
+
     /**
      * Opens the appropriate context menu for *elem*.
      *
@@ -2765,13 +2797,6 @@ Buffer.addPageInfoSection("s", "Security", function (verbose) {
     }
 });
 
-// internal navigation doesn't currently update link[rel='shortlink']
-Buffer.addURIShortener("youtube.com", (uri, doc) => {
-    let video = array.toObject(uri.query.split("&")
-                                        .map(p => p.split("="))).v;
-    return video ? util.newURI("http://youtu.be/" + video) : null;
-});
-
 // catch(e){ if (!e.stack) e = Error(e); dump(e.fileName+":"+e.lineNumber+": "+e+"\n" + e.stack); }
 
 endModule();