Examine source code of HTTPS Open

{
  "manifest_version": 2,
  "name": "HTTPS Open",
  "version": "1.0",
  "description": "Forces all HTTP requests to use HTTPS.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{664b1fdf-f49c-4176-b144-12a140f1d68a}"
    }
  }
}