Examine source code of RTL Force Toggle

{
  "manifest_version": 2,
  "name": "RTL Force Toggle",
  "version": "1.1",
  "description": "toggle page direction to rtl except code",
  "permissions": [
    "activeTab"
  ],
  "icons": {
    "48": "icons/rtl-48.png",
    "96": "icons/rtl.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "commands": {
    "toggle-rtl": {
      "suggested_key": {
        "default": "Ctrl+Shift+L",
        "mac": "Ctrl+Shift+L"
      },
      "description": "change RTL / LTR"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      },
      "id": "{b66826ca-bdfe-4e7f-830a-46df0a99d25b}"
    }
  }
}