Examine source code of Dark Fox for mint

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#2f2f2f",
      "tab_background_text": "#d9d9d9"
    }
  },
  "version": "2.0",
  "name": "Dark Fox for mint",
  "manifest_version": 2,
  "description": "dark firefox theme to match Dark Thunder, and linux Mint 18 dark themes"
}