--- a/toolkit/content/widgets/videocontrols.xml
+++ b/toolkit/content/widgets/videocontrols.xml
@@ -138,17 +138,17 @@
         <span class="errorLabel" anonid="errorNetwork">&error.network;</span>
         <span class="errorLabel" anonid="errorDecode">&error.decode;</span>
         <span class="errorLabel" anonid="errorSrcNotSupported">&error.srcNotSupported;</span>
         <span class="errorLabel" anonid="errorNoSource">&error.noSource2;</span>
         <span class="errorLabel" anonid="errorGeneric">&error.generic;</span>
       </div>
 
       <div anonid="controlsOverlay" class="controlsOverlay stackItem">
-        <div class="controlsSpacerStack" aria-hideen="true">
+        <div class="controlsSpacerStack" aria-hidden="true">
           <div anonid="controlsSpacer" class="controlsSpacer stackItem" role="none"></div>
           <div anonid="clickToPlay" class="clickToPlay" hidden="true"></div>
         </div>
         <div anonid="controlBar" class="controlBar" hidden="true">
           <button anonid="playButton"
                   class="playButton"
                   playlabel="&playButton.playLabel;"
                   pauselabel="&playButton.pauseLabel;"