Examine source code of YouTube Timestamps

{
  "manifest_version": 3,
  "name": "YouTube Timestamps",
  "description": "Shows YouTube timestamps from comments.",
  "version": "1.0.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "youtube-timestamps@ris58h"
    }
  },
  "permissions": [
    "declarativeNetRequestWithHostAccess"
  ],
  "host_permissions": [
    "https://www.youtube.com/"
  ],
  "declarative_net_request": {
    "rule_resources": [
      {
        "id": "ruleset_1",
        "enabled": true,
        "path": "rules.json"
      }
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "service_worker": "background/background.js",
    "type": "module",
    "page": "background/background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://www.youtube-nocookie.com/embed/*"
      ],
      "all_frames": true,
      "js": [
        "content/content.js"
      ],
      "css": [
        "content/content.css"
      ]
    }
  ]
}