Examine source code of Forest Rain (Animated)

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Forest Rain (Animated)",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(55, 73, 51, 0.64)",
      "toolbar_text": "rgb(242, 173, 142)",
      "frame": "rgb(171, 185, 120)",
      "tab_background_text": "rgb(255, 209, 95)",
      "toolbar_field": "rgba(70, 117, 112, 0.36)",
      "toolbar_field_text": "rgb(242, 173, 142)",
      "tab_line": "rgb(124, 45, 23)",
      "popup": "rgba(28, 84, 79, 0.36)",
      "popup_text": "rgb(170, 105, 67)",
      "ntp_background": "rgb(129, 166, 152)",
      "popup_border": "rgba(133, 83, 57, 0.36)",
      "sidebar_border": "rgb(103, 168, 143)",
      "tab_loading": "rgb(124, 45, 23)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9a6cd5ae-49c5-49da-a5a3-85873b897a08}"
    }
  }
}