Examine source code of YouTube Unblocker Plus

{
  "manifest_version": 2,
  "name": "YouTube Unblocker Plus",
  "version": "2.0.6resigned1",
  "default_locale": "de",
  "description": "Gesperrte YouTube-Videos ansehen.",
  "icons": {
    "64": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "addon@ytunblocker.com"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "notifications",
    "storage",
    "tabs",
    "webNavigation",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "index.js",
      "pc.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "data/jquery-3.1.0.min.js",
        "data/modification-script.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "32": "data/youtube-unblock-inactive.png"
    },
    "default_title": "Unblock YouTube",
    "browser_style": true
  },
  "web_accessible_resources": [
    "data/youtube-player-unavailable-logo.png"
  ]
}