Hello! I deploy Firefox in the current ESR Version (45.1.1) and customize it with the mozilla.cfg, userChrome.css and userContent.css in our company. I don't want to use any extension or add-on. I want to remove all functions of Sync, and i am almost done. The last button is the synced-tabs button in the menu. Is there a way to only remove this button and hide it completly with the help of either the cfg file or the css files? I hope you can at least understand my problem, I know my written english is far from being perfect :/ Thank you in advance!