Examine source code of Minecraft Llama

{
  "name": "Minecraft Llama",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "minecraftllamafirefox.png"
    },
    "colors": {
      "frame": "rgba(13, 13, 14, 1)",
      "tab_background_text": "rgba(48, 71, 49, 1)",
      "toolbar": "rgba(36, 112, 61, 0.09)",
      "bookmark_text": "rgba(100, 138, 101, 1)",
      "toolbar_field": "rgba(92, 112, 92, 0.14)",
      "toolbar_field_text": "rgba(100, 138, 101, 0.63)"
    }
  }
}