Examine source code of Stalker Mode ON

{
  "manifest_version": 2,
  "name": "Stalker Mode ON",
  "version": "1.1resigned1",
  "description": "Allows you to see people's Linkedin profile without an account.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f6df44c7-1aa0-419c-8425-2aa6a63e5161}"
    }
  }
}