Examine source code of Informative

{
  "name": "Informative",
  "version": "2.0",
  "description": "Dictionary extension",
  "permissions": [
    "activeTab",
    "https://mashape-community-urban-dictionary.p.rapidapi.com/*",
    "https://googledictionaryapi.eu-gb.mybluemix.net/*"
  ],
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html",
    "default_title": "Easy on meaning!"
  },
  "manifest_version": 2
}