Examine source code of CCF Indy

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_CCF.jpg"
    },
    "colors": {
      "frame": "#b8b2b2",
      "tab_background_text": "#e9f57d"
    }
  },
  "version": "2.0",
  "name": "CCF Indy",
  "manifest_version": 2,
  "description": "Decorate your Firefox browser with the CCF logo!"
}