Examine source code of YouTube Watchtime Tracker

{
  "manifest_version": 2,
  "name": "YouTube Watchtime Tracker",
  "version": "1.12.1",
  "description": "Tracks how much time you spend watching YouTube videos – including time per channel.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/watch*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9527c488-b94f-4d52-ba3c-b447e8e02905}",
      "strict_min_version": "79.0"
    }
  }
}