Examine source code of Green'ify

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Green'ify",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(41, 41, 41)",
      "toolbar_text": "rgb(175, 170, 165)",
      "frame": "rgb(28, 28, 28)",
      "tab_background_text": "rgb(119, 112, 106)",
      "toolbar_field": "rgb(28, 28, 28)",
      "toolbar_field_text": "rgb(221, 219, 218)",
      "tab_line": "rgb(29, 185, 84)",
      "popup": "rgb(41, 41, 41)",
      "popup_text": "rgb(221, 219, 218)",
      "ntp_background": "rgb(41, 41, 41)",
      "ntp_text": "rgb(175, 170, 165)",
      "toolbar_field_border_focus": "rgb(29, 185, 84)",
      "toolbar_field_highlight": "rgb(29, 185, 84)",
      "tab_loading": "rgb(29, 185, 84)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1512c1e0-248d-4079-b9c7-92712a1cf86e}"
    }
  }
}