--- a/browser/components/extensions/ext-windows.js
+++ b/browser/components/extensions/ext-windows.js
@@ -112,29 +112,29 @@ extensions.registerSchemaAPI("windows", 
           // Private browsing tabs can only be moved to private browsing
           // windows.
           let incognito = PrivateBrowsingUtils.isBrowserPrivate(tab.linkedBrowser);
           if (createData.incognito !== null && createData.incognito != incognito) {
             return Promise.reject({message: "`incognito` property must match the incognito state of tab"});
           }
           createData.incognito = incognito;
 
-          args.appendElement(tab, /*weak =*/ false);
+          args.appendElement(tab, /* weak = */ false);
         } else if (createData.url !== null) {
           if (Array.isArray(createData.url)) {
             let array = Cc["@mozilla.org/supports-array;1"].createInstance(Ci.nsISupportsArray);
             for (let url of createData.url) {
               array.AppendElement(mkstr(url));
             }
-            args.appendElement(array, /*weak =*/ false);
+            args.appendElement(array, /* weak = */ false);
           } else {
-            args.appendElement(mkstr(createData.url), /*weak =*/ false);
+            args.appendElement(mkstr(createData.url), /* weak = */ false);
           }
         } else {
-          args.appendElement(mkstr(aboutNewTabService.newTabURL), /*weak =*/ false);
+          args.appendElement(mkstr(aboutNewTabService.newTabURL), /* weak = */ false);
         }
 
         let features = ["chrome"];
 
         if (createData.type === null || createData.type == "normal") {
           features.push("dialog=no", "all");
         } else {
           // All other types create "popup"-type windows by default.