Examine source code of Appfav MyApps

{
  "name": "Appfav MyApps",
  "version": "0.1",
  "manifest_version": 2,
  "description": "Appfavマイアプリを開きます",
  "browser_action": {
    "default_icon": {
      "16": "appfavicon16.png",
      "48": "appfavicon48.png",
      "128": "appfavicon128.png"
    },
    "default_title": "PopUp",
    "default_popup": "popup.html"
  }
}