Examine source code of Twitch to PotPlayer

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "js": [
        "jquery.slim.min.js",
        "youtube.js"
      ],
      "matches": [
        "https://*/*",
        "http://*/*"
      ]
    }
  ],
  "description": "Twitch to PotPlayer",
  "icons": {
    "48": "images/PotPlayer48.png",
    "128": "images/PotPlayer128.png"
  },
  "manifest_version": 2,
  "name": "Twitch to PotPlayer",
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  },
  "page_action": {
    "default_icon": {
      "19": "images/PotPlayer19.png",
      "38": "images/PotPlayer38.png"
    },
    "default_title": "Twitch to PotPlayer",
    "show_matches": [
      "*://*.twitch.tv/*",
      "*://*.naver.com/*",
      "*://vod.afreecatv.com/*",
      "*://*.youtube.com/watch?v=*"
    ]
  },
  "permissions": [
    "webRequest",
    "*://*.twitch.tv/*",
    "*://*.naver.com/*",
    "*://*/*m3u8*",
    "*://*.afreecatv.com/*",
    "*://*.youtube.com/watch?v=*",
    "activeTab",
    "menus",
    "storage"
  ],
  "version": "1.53resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5e3e4d36-39ae-4bbe-95a8-d0666655be3f}"
    }
  }
}