Examine source code of Green Meanie

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Greeny",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(34, 100, 43)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(22, 66, 28)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(17, 52, 26, 0.92)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(17, 52, 26, 0.92)",
      "popup": "rgb(22, 66, 28)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(43, 75, 51)",
      "tab_loading": "rgba(17, 52, 26, 0.92)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a049d42d-b4d6-4db0-be71-244d97b00ce4}"
    }
  }
}