Don't forget to like

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Don't forget to like",
  "version": "0.8",
  "description": "Don't forget to like your favorite videos on youtube.com!",
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage",
    "webNavigation"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.youtube.com/*"
      ],
      "js": [
        "jquery.js",
        "content.js"
      ]
    }
  ],
  "icons": {
    "128": "icon.png"
  }
}