Fixes regression that cause scrolling using spacebar to break in Firefox

web/viewer.html

@@ -227,7 +227,11 @@ limitations under the License.
                     data-l10n-id="page_rotate_cw" ></menuitem>
         </menu>
 
+<!--#if (FIREFOX || MOZCENTRAL) -->
+<!--    <div id="viewerContainer"> -->
+<!--#else -->
         <div id="viewerContainer" tabindex="0">
+<!--#endif -->
           <div id="viewer" contextmenu="viewerContextMenu"></div>
         </div>
 

web/viewer.js

@@ -950,7 +950,9 @@ var PDFView = {
       // unless the viewer is embedded in another page.
       if (window.parent === window) {
         PDFView.container.focus();
-        PDFView.container.blur();
+//#if (FIREFOX || MOZCENTRAL)
+//      PDFView.container.blur();
+//#endif
       }
     });