Examine source code of TEST Pre-Roll Block

{
  "manifest_version": 2,
  "name": "Pre-Roll Block",
  "short_name": "PRB",
  "version": "0.89.2resigned1",
  "description": "Автоматически пропускаем интегрированную в видео рекламу на YouTube.",
  "homepage_url": "http://pre-rollblock.ru",
  "icons": {
    "128": "icons/Preroll.png"
  },
  "applications": {
    "gecko": {
      "id": "PrbFireFixApplications@PrbFireFix",
      "strict_min_version": "50.0"
    }
  },
  "options_page": "option/options.html",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs",
    "storage",
    "activeTab",
    "webRequest",
    "http://pre-rollblock.ru/*",
    "https://www.youtube.com/*"
  ],
  "browser_action": {
    "default_title": "Pre-roll Block",
    "default_icon": "icons/PrerollMini.png",
    "default_popup": "popup/popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "js/jquery-3.3.1.min.js",
        "js/ContentScripts.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ],
      "run_at": "document_end"
    }
  ]
}