diff --git a/mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js b/mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
index 0c992cfa26c..edacd9f2981 100644
--- a/mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
+++ b/mozilla/extensions/inspector/resources/content/viewers/styleRules/styleRules.js
@@ -195,8 +195,7 @@ StyleRulesViewer.prototype =
           var proc = C.classes['@mozilla.org/process/util;1'].createInstance
                        (C.interfaces.nsIProcess);
           proc.init(exe);
-          var pid = {};
-          proc.run(false, [url], 1, pid);
+          proc.run(false, [url], 1);
         } catch (ex) {
           alert("Unable to open editor.");
         }
diff --git a/mozilla/xpcom/threads/nsIProcess.idl b/mozilla/xpcom/threads/nsIProcess.idl
index a2c916ba785..1989d135938 100644
--- a/mozilla/xpcom/threads/nsIProcess.idl
+++ b/mozilla/xpcom/threads/nsIProcess.idl
@@ -11,7 +11,12 @@ interface nsIProcess : nsISupports
 	void kill();
 
     /** XXX what charset? **/
-	void run(in boolean blocking, [array, size_is(count)] in string args, in unsigned long count, out unsigned long pid);
+        /** Executes the file this object was initialized with
+         * @param blocking Whether to wait until the process terminates before returning or not
+         * @param args An array of arguments to pass to the process
+         * @param count The length of the args array
+         * @return the PID of the newly spawned process */
+        unsigned long run(in boolean blocking, [array, size_is(count)] in string args, in unsigned long count);
 
 	readonly attribute nsIFile location;
 	readonly attribute unsigned long pid;