Examine source code of Haspit

{
  "manifest_version": 2,
  "name": "Haspit",
  "version": "1.0",
  "description": "Haspit: A Secured Gateway",
  "icons": {
    "48": "mediumsmall-res.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://mail.google.com/*",
        "https://mail.google.com/mail/*",
        "https://mail.google.com/mail/u/0/#inbox?compose=new",
        "*://mail.yahoo.com/*",
        "https://outlook.live.com/mail/inbox",
        "https://outlook.live.com/mail/*"
      ],
      "js": [
        "gmail.js",
        "function.js",
        "content.js",
        "outlook.js"
      ]
    }
  ],
  "permissions": [
    "webRequest",
    "<all_urls>",
    "webRequestBlocking"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "info@srichidtechnologies.com",
      "strict_min_version": "48.0"
    }
  }
}