PUBLIC MARKS from decembre with tags edit & options

The only way to modify UI is adding custom CSS code to userChrome.css and userContent.css files inside browsers profile folder. Keep in mind CSS code can not create entirely new items, buttons or toolbars. It only can modify already present ui items. 1. Find your profile folder ('profile names are different for everyone'). All OS: about:support > Profile Folder > Open Folder 2. User styles belong into "chrome" subolder. Create it, if there is none yet. PROFILENAME chrome 3. Copy userChrome.css, userContent.css and subfolders into chrome subfolder. How to use custom user styles? The userChrome.css and userContent.css files works like an optionsconfigurations file. All main "features" can be enabled and disabled there.