Examine source code of Hydrangea Macro

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Hydrangea MACRO",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(200, 226, 255, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(144, 151, 236)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(242, 235, 255, 0.5)",
      "toolbar_field_text": "rgb(185, 0, 189)",
      "tab_line": "rgb(0, 233, 255)",
      "popup": "rgb(232, 239, 255)",
      "popup_text": "rgb(55, 0, 166)",
      "ntp_background": "rgb(167, 222, 244)",
      "ntp_text": "rgb(118, 10, 157)",
      "tab_loading": "rgb(0, 233, 255)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{66659acd-6ebf-42f9-84d7-a3095f752b4e}"
    }
  }
}