Examine source code of Resting

{
  "description": "Debug, inspect and test http requests in a easy way",
  "manifest_version": 2,
  "name": "Resting",
  "version": "1.10.0",
  "author": "Mirko Perillo",
  "homepage_url": "https://github.com/mirkoperillo/resting",
  "icons": {
    "32": "icons/letter-r_32.png",
    "64": "icons/letter-r_64.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/letter-r_32.png"
  },
  "permissions": [
    "<all_urls>",
    "webRequest",
    "downloads"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{33730d30-3c0a-46f7-be41-3e0cda806b94}"
    }
  }
}