Examine source code of Scoreboard Tab

{
  "manifest_version": 2,
  "name": "Scoreboard Tab",
  "version": "0.0.3",
  "description": "Scoreboard Tab",
  "chrome_url_overrides": {
    "newtab": "iframe.html"
  },
  "browser_action": {
    "default_title": "Scoreboard Tab -Click Search",
    "default_icon": {
      "16": "img/16.png",
      "128": "img/128.png"
    }
  },
  "icons": {
    "16": "img/16.png",
    "128": "img/128.png"
  }
}