Examine source code of YoutubeToPiped

{
  "manifest_version": 2,
  "name": "YtP",
  "version": "0.3",
  "description": "changes yt to piped",
  "icons": {
    "48": "icons/border-48.png"
  },
  "background": {
    "scripts": [
      "YtP.js"
    ]
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a912b414-1bec-400e-916b-2a6fd4f492a2}"
    }
  }
}