Examine source code of Green Atmosphere

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green Atmosphere",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-036-40a272fe657f748396e017c7a64ee2dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(38, 40, 40)",
      "toolbar_text": "rgb(0, 255, 159)",
      "frame": "rgb(49, 51, 51)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(38, 40, 40)",
      "toolbar_field_text": "rgb(0, 255, 159)",
      "tab_line": "rgb(0, 255, 159)",
      "popup": "rgb(38, 40, 40)",
      "popup_text": "rgb(0, 255, 159)",
      "button_background_active": "rgb(59, 84, 86)",
      "button_background_hover": "rgb(50, 59, 59)",
      "ntp_background": "rgb(14, 15, 15)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_highlight_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 255, 159)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa1029aa-64d2-49f4-a02e-b9c84f0f53d1}"
    }
  }
}