Fix right sidebar to not expand past its boundaries

mobile/chrome/content/BrowserView.js

@@ -510,7 +510,7 @@ BrowserView.prototype = {
   },
   // !!! --- RESIZE HACK END -------
 
-  handleMozAfterSizeChange: function handleMozAfterPaint(ev) {
+  handleMozAfterSizeChange: function handleMozAfterSizeChange(ev) {
     // !!! --- RESIZE HACK BEGIN -----
     // get the correct properties off of the event, these are wrong because
     // we're using a MouseEvent, as it has an X and Y prop of some sort and

mobile/chrome/content/browser.xul

@@ -244,7 +244,7 @@
       <vbox>
         <spacer class="sidebar-spacer"/>
 
-        <vbox id="browser-controls" class="panel-dark">
+        <vbox id="browser-controls" style="overflow: -moz-hidden-unscrollable;" class="panel-dark">
           <toolbarbutton id="tool-star" class="browser-control-button button-image" command="cmd_star"/>
           <toolbarbutton id="tool-back" class="browser-control-button button-image" command="cmd_back"/>
           <toolbarbutton id="tool-forward" class="browser-control-button button-image" command="cmd_forward"/>