Examine source code of Text Direction Toggle

{
  "manifest_version": 2,
  "name": "Text Direction Toggle",
  "version": "1.1",
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e1237604-a095-461a-a220-b7043fefef36}"
    }
  }
}