Examine source code of LG Craft for Firefox

{
  "manifest_version": 2,
  "name": "LG Craft for Firefox",
  "version": "0.2",
  "description": "Adds support for tab-dependent contextual use of Crown in Firefox for Logitech Craft Keyboard",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webNavigation",
    "contextMenus",
    "tabs",
    "activeTab",
    "<all_urls>",
    "http://*/*",
    "https://*/*",
    "ws://*/*",
    "wss://*/*"
  ],
  "applications": {
    "gecko": {
      "strict_min_version": "55.0",
      "id": "{de548051-311a-4a0b-adda-b84b4a2dcec0}"
    }
  },
  "icons": {
    "16": "icons/firefox-craft-16.png",
    "32": "icons/firefox-craft-32.png",
    "48": "icons/firefox-craft-48.png",
    "60": "icons/firefox-craft-60.png",
    "96": "icons/firefox-craft-96.png",
    "128": "icons/firefox-craft-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "youtube.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  }
}