Fixes 4065 - Subscription links on Chrome 30

subscriptionLink.postload.js

Index: subscriptionLink.postload.js
diff --git a/subscriptionLink.postload.js b/subscriptionLink.postload.js
index 7212d635eae05f1a2c6746a03c50209da7b79310..bb37f6005996d09d87c7e1cb868a9ca871ab2fdf 100644
--- a/subscriptionLink.postload.js
+++ b/subscriptionLink.postload.js
@@ -43,12 +43,23 @@ if ("ext" in window && document instanceof HTMLDocument)
         return;
     }
 
+    let queryString = null;
     if (link.protocol == "http:" || link.protocol == "https:")
     {
-      if (link.host != "subscribe.adblockplus.org" || link.pathname != "/")
-        return;
+      if (link.host == "subscribe.adblockplus.org" && link.pathname == "/")
+        queryString = link.search.substr(1);
+    }
+    else
+    {
+      // Old versions of Chrome (30) don't populate the "search" property for
+      // links with non-standard URL schemes so we need to extract the query
+      // string manually.
+      let match = /^abp:\/*subscribe\/*\?(.*)/i.exec(link.href);
+      if (match)
+        queryString = match[1];
     }
-    else if (!/^abp:\/*subscribe\/*\?/i.test(link.href))
+
+    if (!queryString)
       return;
 
     // This is our link - make sure the browser doesn't handle it
@@ -56,7 +67,7 @@ if ("ext" in window && document instanceof HTMLDocument)
     event.stopPropagation();
 
     // Decode URL parameters
-    var params = link.search.substr(1).split("&");
+    var params = queryString.split("&");
     var title = null;
     var url = null;
     for (var i = 0; i < params.length; i++)