add hamburger

themes/userChrome.css

@@ -1,9 +1,4 @@
 @-moz-document url("chrome://browser/content/browser.xhtml")  {
-	/* get rid of hamburgers */
-	#PanelUI-menu-button {
-		display: none;
-	}
-
 	/* hide top tabs (for sideberry) */
 	#TabsToolbar {
 		visibility: collapse !important;