Examine source code of DoubanListingHelper

{
  "manifest_version": 2,
  "name": "DoubanListingHelper",
  "version": "1.0",
  "description": "豆瓣添加条目助手",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://music.douban.com/new_subject",
        "https://www.douban.com/game/create",
        "https://movie.douban.com/new_subject",
        "*://store.steampowered.com/*",
        "*://*.bandcamp.com/*",
        "*://www.discogs.com/*master*",
        "*://*.bandcamp.com/*",
        "*://www.discogs.com/*release*",
        "*://music.apple.com/*/album/*",
        "*://*.imdb.com/title/*"
      ],
      "js": [
        "node_modules/webextension-polyfill/dist/browser-polyfill.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "node_modules/webextension-polyfill/dist/browser-polyfill.js",
      "background.js"
    ]
  },
  "permissions": [
    "downloads",
    "tabs"
  ]
}