Examine source code of TubeTweaks

{
  "manifest_version": 3,
  "name": "TubeTweaks",
  "description": "Various enhancements for YouTube",
  "version": "1.0.3",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "webRequestFilterResponse",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "html/popup.html"
  },
  "options_ui": {
    "page": "html/settings.html"
  },
  "host_permissions": [
    "https://www.youtube.com/*",
    "https://music.youtube.com/*",
    "https://youtu.be/*"
  ],
  "icons": {
    "128": "assets/logo_128x128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tubetweaks@extensions.xenorio.xyz"
    }
  }
}