Examine source code of 80s Arcade

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "80s Arcade",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(197, 255, 0)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(121, 255, 245)",
      "toolbar_field": "rgb(12, 6, 26)",
      "toolbar_field_text": "rgb(228, 54, 179)",
      "tab_line": "rgb(197, 255, 0)",
      "popup": "rgb(12, 6, 26)",
      "popup_text": "rgb(228, 54, 179)",
      "ntp_background": "rgb(0, 0, 0)",
      "tab_loading": "rgb(197, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1223ebe6-061f-4abb-a4e8-5787c846ed4f}"
    }
  }
}