Examine source code of Invidioucious

{
  "manifest_version": 2,
  "name": "Invidioucious",
  "version": "0.9.8.4",
  "description": "This extension for Firefox aims to redirect all requests made to Youtube to an Invidious instance.",
  "icons": {
    "48": "icons/invidioucious-48.png",
    "96": "icons/invidioucious-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "invidioucious.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/invidioucious-48.png",
      "96": "icons/invidioucious-96.png"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "applications": {
    "gecko": {
      "id": "invidioucious@wolke7.net"
    }
  }
}