Followup to bug 315004, r=mconnor.

toolkit/mozapps/extensions/content/about.js

@@ -74,7 +74,15 @@ function init()
   if (homepage) {
     homepage = homepage.QueryInterface(Components.interfaces.nsIRDFLiteral).Value;
     // only allow http(s) homepages
-    if (!/^https?:/.test(homepage))
+    var scheme = "";
+    var uri = null;
+    try {
+      uri = makeURI(homepage);
+      scheme = uri.scheme;
+    } catch (ex) {}
+    if (uri && (scheme == "http" || scheme == "https"))
+      homepage = uri.spec;
+    else
       homepage = null;
   }
     

toolkit/mozapps/extensions/content/about.xul

@@ -48,6 +48,7 @@
         buttons="accept" onload="init();" onaccept="close();">
 
   <script type="application/x-javascript" src="chrome://mozapps/content/extensions/about.js"/>
+  <script type="application/x-javascript" src="chrome://global/content/contentAreaUtils.js"/>
   
   <stringbundleset id="aboutSet">
     <stringbundle id="extensionsStrings" src="chrome://mozapps/locale/extensions/extensions.properties"/>

toolkit/mozapps/extensions/content/extensions.js

@@ -1002,8 +1002,15 @@ var gExtensionsViewController = {
     {
       if (!aSelectedItem) return;
       var homepageURL = aSelectedItem.getAttribute("homepageURL");
-      if (/^https?:/.test(homepageURL))
-        openURL(homepageURL);
+      // only allow http(s) homepages
+      var scheme = "";
+      var uri = null;
+      try {
+        uri = makeURI(homepageURL);
+        scheme = uri.scheme;
+      } catch (ex) {}
+      if (uri && (scheme == "http" || scheme == "https"))
+        openURL(uri.spec);
     },
     
     cmd_about: function (aSelectedItem)

toolkit/mozapps/extensions/content/extensions.xul

@@ -59,6 +59,7 @@
         onclose="return closeWindow(false);">
 
   <script type="application/x-javascript" src="chrome://global/content/globalOverlay.js"/>
+  <script type="application/x-javascript" src="chrome://global/content/contentAreaUtils.js"/>
   <script type="application/x-javascript" src="chrome://mozapps/content/extensions/extensions.js"/>
   <script type="application/x-javascript" src="chrome://global/content/nsDragAndDrop.js"/>
   <script type="application/x-javascript" src="chrome://global/content/nsTransferable.js"/>