Examine source code of LeagueBoards.net Plugin

{
  "description": "Replaces the links from old League forums with LeagueBoards mirror link.",
  "manifest_version": 2,
  "name": "LeagueBoards.net Plugin",
  "version": "1.3",
  "homepage_url": "https://github.com/Arcyvilk/leagueboards-plugin",
  "icons": {
    "48": "icons/ico-48.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "http://*.leagueoflegends.com/*"
  ],
  "background": {
    "scripts": [
      "plugin.js"
    ]
  }
}