Don't chop off the last character of the URL for remote commands with a comma. b=298960 r=bsmedberg

browser/components/nsBrowserContentHandler.js

@@ -252,7 +252,7 @@ var nsBrowserContentHandler = {
         if (sepIndex == -1)
           remoteParams[0] = a[2];
         else {
-          remoteParams[0] = a[2].substring(0, sepIndex - 1);
+          remoteParams[0] = a[2].substring(0, sepIndex);
           remoteParams[1] = a[2].substring(sepIndex + 1);
         }