Examine source code of Careerbase - Job Application Tracker

{
  "manifest_version": 3,
  "name": "Careerbase - Job Application Tracker",
  "version": "1.0.1",
  "description": "Track job applications directly from Gmail and LinkedIn. Login to your Careerbase account and save applications with one click.",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://careerbase-api-bxavdzaje8hnhhec.francecentral-01.azurewebsites.net/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "128": "icons/icon128.png"
  },
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://www.linkedin.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "support@careerbase.tech",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteContent",
          "personallyIdentifyingInfo"
        ]
      }
    }
  }
}