Examine source code of Sejda PDF Editor

{
  "manifest_version": 2,
  "name": "Sejda PDF Editor",
  "version": "1.0",
  "description": "Quick access to Sejda PDF Editor and tools like Merge, Split, Edit, and more.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "popup.html",
    "default_title": "Sejda PDF Editor"
  },
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cb239d72-440a-4734-a7a6-09af8c3bcf9c}"
    }
  }
}