Examine source code of Retro effect

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Retro effect",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-040-0df8e190c15355cd3fa41a58e86426a9.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(165, 51, 101)",
      "toolbar_text": "rgb(97, 192, 171)",
      "frame": "rgb(97, 192, 171)",
      "tab_background_text": "rgb(76, 56, 77)",
      "toolbar_field": "rgb(255, 238, 219)",
      "toolbar_field_text": "rgb(165, 51, 101)",
      "tab_line": "rgb(173, 168, 181)",
      "popup": "rgb(255, 238, 219)",
      "popup_text": "rgb(76, 56, 77)",
      "ntp_background": "rgb(173, 168, 181)",
      "tab_loading": "rgb(173, 168, 181)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{358209ce-7848-484a-af74-5d354c933a85}"
    }
  }
}