Examine source code of dark and green poly

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "dark and green poly",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "bckgr.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(13, 21, 21)",
      "toolbar_text": "rgb(0, 226, 0)",
      "frame": "rgb(13, 21, 21)",
      "tab_background_text": "rgb(192, 192, 192)",
      "toolbar_field": "rgb(28, 28, 28)",
      "toolbar_field_text": "rgb(0, 226, 0)",
      "tab_line": "rgb(0, 226, 0)",
      "popup": "rgb(13, 21, 21)",
      "popup_text": "rgb(0, 226, 0)",
      "icons_attention": "rgb(0, 226, 0)",
      "ntp_background": "rgb(13, 21, 21)",
      "ntp_text": "rgb(0, 226, 0)",
      "popup_border": "rgb(0, 226, 0)",
      "popup_highlight_text": "rgb(13, 21, 21)",
      "popup_highlight": "rgb(0, 226, 0)",
      "sidebar_border": "rgb(0, 226, 0)",
      "sidebar_highlight_text": "rgb(13, 21, 21)",
      "sidebar_highlight": "rgb(0, 226, 0)",
      "sidebar_text": "rgb(0, 226, 0)",
      "sidebar": "rgb(13, 21, 21)",
      "tab_loading": "rgb(0, 226, 0)",
      "toolbar_field_border_focus": "rgb(0, 226, 0)",
      "toolbar_field_focus": "rgba(13, 21, 21, 0.5)",
      "toolbar_field_highlight_text": "rgb(13, 21, 21)",
      "toolbar_field_highlight": "rgb(0, 226, 0)"
    }
  },
  "applications": {
    "gecko": {
      "id": "dark-green-poly@cpl"
    }
  }
}