Examine source code of PompaTeam & Friends

{
  "author": "Spyrek",
  "background": {
    "scripts": [
      "js/jquery.min.js",
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "images/icon_48.png",
    "default_popup": "popup.html",
    "default_title": "PompaTeam & Friends"
  },
  "content_scripts": [
    {
      "css": [
        "css/style.css"
      ],
      "js": [
        "js/jquery.min.js",
        "js/safeResponse.js",
        "js/script.js",
        "background.js",
        "popup.js"
      ],
      "matches": [
        "https://api.pompateam.pl/browser/json.php",
        "https://youtube.com/*",
        "http://www.twitch.tv/*",
        "https://www.twitch.tv/*"
      ]
    }
  ],
  "description": "Rozszerzenie powiadamiające o aktywności PompaTeam & Friends",
  "homepage_url": "https://www.pompateam.pl",
  "icons": {
    "32": "images/icon_32.png",
    "48": "images/icon_48.png",
    "64": "images/icon_64.png",
    "128": "images/icon_128.png"
  },
  "manifest_version": 2,
  "name": "PompaTeam & Friends",
  "permissions": [
    "notifications",
    "https://api.pompateam.pl/browser/json.php",
    "https://youtube.com/*",
    "http://www.twitch.tv/*",
    "https://www.twitch.tv/*",
    "tabs",
    "storage"
  ],
  "short_name": "PompaTeam & Friends",
  "version": "1.3.19resigned1",
  "web_accessible_resources": [
    "images/icon_48.png"
  ],
  "applications": {
    "gecko": {
      "id": "powiadamiacz@pompateam.pl"
    }
  }
}