--- a/toolkit/components/thumbnails/test/browser_thumbnails_bg_no_cookies_stored.js
+++ b/toolkit/components/thumbnails/test/browser_thumbnails_bg_no_cookies_stored.js
@@ -14,16 +14,16 @@ function* runTests() {
   ok(thumbnailExists(url), "Thumbnail file should exist after capture.");
   removeThumbnail(url);
   // now load it up in a browser - it should *not* be red, otherwise the
   // cookie above was saved.
   let tab = yield BrowserTestUtils.openNewForgroundTab(gBrowser, url);
   let browser = tab.linkedBrowser;
 
   // The root element of the page shouldn't be red.
-  yield ContentTask.spawn(browser, null, function(){
+  yield ContentTask.spawn(browser, null, function() {
     Assert.notEqual(content.document.documentElement.style.backgroundColor,
                     "rgb(255, 0, 0)",
                     "The page shouldn't be red.");
   });
 
   gBrowser.removeTab(tab);
 }