--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -1220,16 +1220,17 @@
       <toolbarbutton id="fullscreen-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
                      observes="View:FullScreen"
                      type="checkbox"
                      label="&fullScreenCmd.label;"
                      tooltip="dynamic-shortcut-tooltip"/>
 #ifdef MOZ_PHOTON_THEME
       <toolbarbutton id="library-button" class="toolbarbutton-1 chromeclass-toolbar-additional"
                      oncommand="PanelUI.showSubView('appMenu-libraryView', this, null, true);"
+                     closemenu="none"
                      label="&places.library.title;"/>
 #endif
     </toolbarpalette>
   </toolbox>
 
   <hbox id="fullscr-toggler" hidden="true"/>
 
   <deck id="content-deck" flex="1">