Examine source code of Spider Man 2099

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Spider Man 2099",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(35, 44, 82)",
      "toolbar_text": "rgb(136, 191, 225)",
      "frame": "rgb(116, 175, 230)",
      "tab_background_text": "rgb(79, 0, 17)",
      "toolbar_field": "rgb(142, 0, 0)",
      "toolbar_field_text": "rgb(255, 122, 122)",
      "tab_line": "rgb(142, 0, 0)",
      "popup": "rgb(142, 0, 0)",
      "popup_text": "rgb(255, 122, 122)",
      "button_background_active": "rgb(165, 0, 0)",
      "button_background_hover": "rgb(62, 0, 255)",
      "icons_attention": "rgb(9, 160, 249)",
      "icons": "rgb(255, 104, 104)",
      "ntp_background": "rgb(25, 24, 74)",
      "ntp_text": "rgb(255, 195, 195)",
      "popup_highlight_text": "rgb(255, 0, 0)",
      "tab_loading": "rgb(142, 0, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c78833c1-ea92-453d-8294-923249950ad7}"
    }
  }
}