Examine source code of Contrast Flowers

{
  "name": "Contrast",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "dark-flowers.png"
    },
    "colors": {
      "frame": "rgba(110, 110, 110, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(0, 0, 0, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(3, 3, 3, 0)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 255, 26, 0.63)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cfd6252a-2381-4f4b-9f69-7c07b7033592}"
    }
  }
}