Examine source code of Watch Together Emoji

{
  "manifest_version": 2,
  "name": "Watch Together Emoji",
  "version": "1.0.0",
  "description": "Cho phép thả emoji nổi lên khung phim. Gửi nhanh 'gói emoji' (copy/paste) để bạn bè hiển thị emoji mà không cần chat.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "storage",
    "clipboardWrite",
    "activeTab",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "watch-together-emoji@example.com",
      "strict_min_version": "60.0"
    }
  }
}