fixup! Bug 23247: Communicating security expectations for .onion

Bug 41533: Fix onion detection on the page info window

browser/base/content/pageinfo/security.js

@@ -66,7 +66,12 @@ var security = {
         Ci.nsIWebProgressListener.STATE_LOADED_MIXED_DISPLAY_CONTENT);
     var isEV = ui.state & Ci.nsIWebProgressListener.STATE_IDENTITY_EV_TOPLEVEL;
     var isOnion = false;
-    const hostName = this.windowInfo.hostName;
+    let hostName;
+    try {
+      hostName = Services.eTLD.getBaseDomain(this.uri);
+    } catch (e) {
+      hostName = this.windowInfo.hostName;
+    }
     if (hostName && hostName.endsWith(".onion")) {
       isOnion = true;
     }