Examine source code of GreenStone

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "GreenStone",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(86, 107, 106)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(66, 80, 79)",
      "tab_background_text": "rgb(231, 255, 255)",
      "toolbar_field": "rgb(51, 60, 60)",
      "toolbar_field_text": "rgb(231, 255, 255)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(166, 178, 178)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1f4f59fc-fb47-4166-ad3e-b4c972655b81}"
    }
  }
}