Examine source code of Grün

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Grün",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(55, 78, 74)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(46, 34, 47)",
      "tab_background_text": "rgb(199, 220, 208)",
      "toolbar_field": "rgba(49, 54, 56, 0.5)",
      "toolbar_field_text": "rgb(199, 220, 208)",
      "tab_line": "rgba(150, 108, 108, 0.84)",
      "popup": "rgba(46, 34, 47, 0.75)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgba(146, 169, 132, 0.5)",
      "button_background_hover": "rgba(84, 126, 100, 0.5)",
      "icons": "rgb(255, 255, 255)",
      "ntp_background": "rgb(55, 78, 74)",
      "ntp_text": "rgb(199, 220, 208)",
      "popup_border": "rgba(31, 34, 61, 0)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "popup_highlight": "rgba(84, 126, 100, 0.75)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(84, 126, 100)",
      "tab_loading": "rgba(150, 108, 108, 0.84)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0289cc2c-a4eb-4f2b-9d85-7d7d72a855e6}"
    }
  }
}