Examine source code of RestPilot

{
  "manifest_version": 2,
  "name": "RestPilot - your co-pilot for REST APIs",
  "version": "1.0.0",
  "description": "A lightweight REST API testing tool for Firefox. Test GET, POST, PUT, DELETE and other HTTP methods with custom headers and body.",
  "author": "Idrees Kema",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_title": "RestPilot API Tester",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{d9f195d3-28b0-4730-92ae-6da23add034e}"
    }
  }
}