1. Navigate to your profile folder [1]. 2. cd chrome or create the directory if it isn't there 3. Inside chrome, open userChrome.css or create it if it isn't

1. Navigate to your profile folder [1]. 2. cd chrome or create the directory if it isn't there 3. Inside chrome, open userChrome.css or create it if it isn't there 4. Paste the following: @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* to hide the native tabs */ #TabsToolbar { visibility: collapse; } /* to hide the sidebar header */ #sidebar-box[sidebarcommand="treestyletab_piro_sakura_ne_jp-sidebar-action"] #sidebar-header { display: none; } 5. Restart Firefox --- 1. http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigatin...