Examine source code of Abstract Trees

{
  "name": "Abstract Trees",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "AbstractTrees.jpg"
    },
    "colors": {
      "frame": "rgba(75, 75, 90, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(77, 76, 92, 0)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(77, 76, 92, 0.1)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{ff57633e-fab0-4edd-8eb8-e8b988ee91ee}"
    }
  }
}