Examine source code of Adding Random Padding

{
  "manifest_version": 2,
  "name": "Adding Random Padding",
  "version": "1",
  "author": "javan.de",
  "description": "Adding a random padding to any request.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Request Padding",
    "default_icon": {
      "48": "media/button-48.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "applications": {
    "gecko": {
      "id": "request-padding@javan.de"
    }
  }
}