Examine source code of Linkedin-1fa

{
  "description": "Linkedin-1fa",
  "manifest_version": 2,
  "name": "Linkedin-1fa",
  "version": "1.0.0",
  "homepage_url": "https://github.com/EasyAdNO/linkedin-1fa",
  "icons": {
    "48": "icons/page-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/page-32.png"
  },
  "browser_specific_settings": {
    "gecko_android": {},
    "gecko": {
      "id": "{d7de4665-5cc0-46b1-8874-0a5e24ab3c93}"
    }
  },
  "permissions": [],
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/campaignmanager*"
      ],
      "js": [
        "linkedin-1fa.js"
      ]
    }
  ]
}