I have foxclocks installed "{d37dc5d0-431d-44e5-8c91-49419370caa1}.xpi"
I have enabled use of chrome/userChrome.css and have hidden menu items so I know it is working.
I like to hide the "closer" in fox clocks but how do I reference it in chrome/userChrome.css
I tried
#closer { display: none !important }
but didnt work?
See image below