Examine source code of Spiderman theme

{
  "update_url" : "https://clients2.google.com/service/update2/crx" ,
  "manifest_version" : 3 ,
  "name" : "__MSG_extName__" ,
  "version" : "1.0.0",
  "default_locale" : "en" ,
  "description" : "__MSG_extDescription__" ,
  "theme": {
    "colors": {
      "frame": [
        250,
        237,
        173,
        1
      ],
      "toolbar": [
        255,
        255,
        255,
        1
      ],
      "toolbar_text": [
        0,
        0,
        0
      ],
      "toolbar_button_icon": [
        0,
        0,
        0
      ],
      "ntp_background": [
        0,
        0,
        0
      ],
      "tab_text": [
        0,
        0,
        0
      ],
      "tab_background_text": [
        255,
        255,
        255
      ],
      "omnibox_text": [
        0,
        0,
        0
      ],
      "omnibox_background": [
        255,
        255,
        255,
        0.5
      ]
    },
    "images": {
      "theme_ntp_background": "images/theme_frame.png"
    }
  },
  "properties": {
    "ntp_background_alignment": "center",
    "ntp_background_repeat": "no-repeat",
    "ntp_logo_alternate": 0
  }
}