Examine source code of Counter Strike - HOWL

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#330a0a",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Counter Strike - HOWL",
  "manifest_version": 2,
  "description": "Description:\nHowl Sticker. White fire in background.\nBackground dark red.\n\nIf you want the theme fits well:\nPut the Menu Bar, Bookmarks Toolbar\nThere must not be the Title bar (white in the top)\nTo change it, right click on the top of your navigator and clic Customize"
}