GrApple Delicious – Get this Add-on for 🦊 Firefox (ja)You can customize the theme style with the following code in your userChrome.css About the userChrome.css: This file sets the display rules for various elements in the Firefox user interface and is located in the sub-folder called chrome in your profile folder. ~/Library/Application Support/Firefox/Profiles/xxxxxxx.default/chrome/ The file does not exist by default, so you need to create it before
