Examine source code of Stained Red.Dark

{
  "theme": {
    "images": {
      "theme_frame": "persona1-header3.jpg"
    },
    "colors": {
      "frame": "#420404",
      "tab_background_text": "#d1d1d1"
    }
  },
  "version": "2.0",
  "name": "Stained Red.Dark",
  "manifest_version": 2,
  "description": "Originally I created a background image for my Twitter account. In the end I really liked the black/dark red/white combination and wanted to use it for Firefox as well.\nAnd this is my try to share it with others which might have a similar taste."
}