Examine source code of ClickSound

{
  "manifest_version": 2,
  "name": "ClickSound",
  "version": "1.3",
  "description": "Âm thanh tùy chỉnh cho click link, mở tab, đóng tab.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_title": "ClickSound",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "clicksound@amo",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}