Examine source code of Notion R2L

{
  "browser_specific_settings": {
    "gecko": {
      "id": "notionR2L@williamayoub.com",
      "strict_min_version": "57.0"
    }
  },
  "name": "Notion R2L",
  "version": "1.5.0",
  "description": "An extension to add R2L support for https://notion.so",
  "manifest_version": 2,
  "permissions": [
    "*://*.notion.so/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.notion.so/*"
      ],
      "js": [
        "src/index.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "icons": {
    "16": "logo/logo-16.png",
    "32": "logo/logo-32.png",
    "48": "logo/logo-48.png",
    "128": "logo/logo-128.png"
  }
}