Examine source code of Web to Plex

{
  "name": "Web to Plex",
  "description": "Adds a button on various movie & TV show sites to open it in Plex.",
  "manifest_version": 2,
  "version": "3.5resigned1",
  "icons": {
    "16": "img/16.png",
    "48": "img/48.png",
    "128": "img/128.png"
  },
  "applications": {
    "gecko": {
      "id": "{05243336-ce19-46df-95af-680070c96134}",
      "strict_min_version": "57.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://movieo.me/*"
      ],
      "js": [
        "history-hack.js",
        "utils.js",
        "movieo.js"
      ],
      "css": [
        "movieo.css"
      ]
    },
    {
      "matches": [
        "*://*.imdb.com/*"
      ],
      "js": [
        "utils.js",
        "imdb.js"
      ],
      "css": [
        "imdb.css"
      ]
    },
    {
      "matches": [
        "https://trakt.tv/*"
      ],
      "js": [
        "history-hack.js",
        "utils.js",
        "trakt.js"
      ],
      "css": [
        "trakt.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "options_ui": {
    "page": "options/index.html",
    "chrome_style": true
  },
  "permissions": [
    "storage",
    "http://*/",
    "https://*/"
  ]
}