Examine source code of doubanIMDb

{
  "manifest_version": 2,
  "name": "doubanIMDb",
  "version": "0.8.1",
  "icons": {
    "128": "assets/icons/favicon-128.png"
  },
  "description": "Douban Movie + IMDb + Rotten Tomatoes",
  "homepage_url": "https://github.com/lisongx/doubanIMDb/",
  "short_name": "douban IMDb",
  "permissions": [
    "*://movie.douban.com/*",
    "https://query.wikidata.org/sparql",
    "https://douban-imdb-api.herokuapp.com/"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "author": "Li Song",
  "applications": {
    "gecko": {
      "id": "{108db837-aa97-41d1-a605-568bd97ec531}"
    }
  },
  "options_ui": {
    "page": "fancy-settings/source/index.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "assets/icons/favicon-128.png"
    },
    "default_title": "豆瓣IMdb",
    "browser_style": false
  },
  "background": {
    "scripts": [
      "js/fancySettings.bundle.js",
      "js/background.bundle.js"
    ]
  },
  "web_accessible_resources": [
    "assets/*.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://movie.douban.com/*"
      ],
      "js": [
        "js/contentScript.bundle.js"
      ]
    }
  ]
}