Examine source code of HTTP Headers Optimizer

{
  "manifest_version": 2,
  "name": "HTTP Headers Optimizer",
  "version": "1.0",
  "description": "This extension optimizes HTTP headers for the website being accessed.",
  "permissions": [
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "HeadersOptimizer@mail.com"
    }
  }
}