Examine source code of Searchonymous WE

{
  "manifest_version": 2,
  "name": "Searchonymous WE",
  "version": "1.0.1resigned1",
  "description": "Search anonymously on Google while staying logged in on services such as Youtube, Gmail, etc.",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{9e7ced7a-0511-4250-999a-afa1f238dc14}"
    }
  }
}