Examine source code of Auto Font Booster

{
  "manifest_version": 2,
  "name": "Auto Font Booster",
  "version": "1.0",
  "description": "Ghi nhớ website và tự động tăng font size khi quay lại.",
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_title": "Auto Font Booster"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4343bc8d-3b22-4e73-858a-e7d34c24e145}"
    }
  }
}