Examine source code of Star Wars Dark Side Mode

{
  "name": "Star Wars Dark Side Mode",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "1280px-HD_transparent_picture.png"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(179, 113, 113, 1)",
      "toolbar": "rgba(87, 7, 4, 1)",
      "bookmark_text": "rgba(224, 22, 22, 1)",
      "toolbar_field": "rgba(120, 15, 12, 1)",
      "toolbar_field_text": "rgba(179, 113, 113, 1)",
      "tab_line": "rgba(255, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f4240b15-be3a-4d4c-a333-0b55af4fe8bb}"
    }
  }
}