Add missing comma

toolkit/themes/pinstripe/global/toolbarbutton.css

@@ -80,7 +80,7 @@ toolbarbutton[open="true"][buttonstyle="text"] {
 
 toolbarbutton[disabled="true"],
 toolbarbutton[disabled="true"]:hover,
-toolbarbutton[disabled="true"]:hover:active
+toolbarbutton[disabled="true"]:hover:active,
 toolbarbutton[disabled="true"][open="true"] {
   color: -moz-mac-disabledtoolbartext !important;
 }