diff --git a/browser/base/content/sync/progress.js b/browser/base/content/sync/progress.js
index bbbafeed7620..f336c93be625 100644
--- a/browser/base/content/sync/progress.js
+++ b/browser/base/content/sync/progress.js
@@ -18,10 +18,10 @@ function onLoad(event) {
   gProgressBar = document.getElementById('uploadProgressBar');
 
   if (Services.prefs.getPrefType("services.sync.firstSync") != Ci.nsIPrefBranch.PREF_INVALID) {
-    gProgressBar.style.display = "inline";
+    gProgressBar.hidden = false;
   }
   else {
-    gProgressBar.style.display = "none";
+    gProgressBar.hidden = true;
   }
 }