Examine source code of Corsify

{
  "manifest_version": 2,
  "name": "Corsify",
  "version": "1.0.1resigned1",
  "description": "Enable CORS by transforming http response",
  "homepage_url": "https://github.com/tushararora/corsify",
  "permissions": [
    "storage",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "icons": {
    "32": "images/corsify-32.png",
    "48": "images/corsify-48.png",
    "96": "images/corsify-96.png"
  },
  "browser_action": {
    "default_icon": "images/corsify-32.png",
    "default_title": "Corsify",
    "default_popup": "popup/index.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{694e183b-5c09-4c68-9732-4af75bb5b813}"
    }
  }
}