Examine source code of Padlet board

{
  "manifest_version": 2,
  "name": "Padlet Web Clipper",
  "version": "1.0",
  "description": "Quickly save selected text or links to your Padlet board.",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "contextMenus",
    "storage",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62a5e2bc-3ac6-4360-aaf4-9b3f00966921}"
    }
  }
}