Examine source code of LagSync - Bluetooth Audio Fix

{
  "manifest_version": 3,
  "name": "LagSync - Bluetooth Audio Fix",
  "version": "1.4.2",
  "description": "Fix audio and video delay caused by Bluetooth latency. Sync your sound perfectly on YouTube, Netflix, and more.",
  "permissions": [
    "storage",
    "scripting",
    "activeTab"
  ],
  "host_permissions": [
    "*://*.youtube.com/*",
    "*://*.youtube-nocookie.com/*",
    "*://*.youtu.be/*",
    "*://*.netflix.com/*",
    "*://*.twitch.tv/*",
    "*://*.vimeo.com/*",
    "*://*.disneyplus.com/*",
    "*://*.primevideo.com/*",
    "*://*.amazon.com/*",
    "*://*.hulu.com/*",
    "*://*.max.com/*",
    "*://*.hbomax.com/*",
    "*://*.peacocktv.com/*",
    "*://*.paramountplus.com/*",
    "*://*.tv.apple.com/*",
    "*://*.crunchyroll.com/*",
    "*://*.dailymotion.com/*",
    "*://*.plex.tv/*",
    "*://*.kick.com/*"
  ],
  "optional_host_permissions": [
    "*://*/*",
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*",
        "*://*.youtube-nocookie.com/*",
        "*://*.youtu.be/*",
        "*://*.netflix.com/*",
        "*://*.twitch.tv/*",
        "*://*.vimeo.com/*",
        "*://*.disneyplus.com/*",
        "*://*.primevideo.com/*",
        "*://*.amazon.com/*",
        "*://*.hulu.com/*",
        "*://*.max.com/*",
        "*://*.hbomax.com/*",
        "*://*.peacocktv.com/*",
        "*://*.paramountplus.com/*",
        "*://*.tv.apple.com/*",
        "*://*.crunchyroll.com/*",
        "*://*.dailymotion.com/*",
        "*://*.plex.tv/*",
        "*://*.kick.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "action": {
    "default_popup": "popup/index.html",
    "default_title": "Open LagSync Controls",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@lagsync.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "page_script.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}