Examine source code of Job Defender

{
  "manifest_version": 3,
  "name": "Job Defender",
  "version": "1.1.1",
  "description": "An extension that filters job listings by company names. Easily block or highlight companies you want to avoid. Future updates will bring more filtering and customization features. ",
  "icons": {
    "16": "./icons/active/favicon-16x16.png",
    "32": "./icons/active/favicon-32x32.png",
    "192": "./icons/active/android-chrome-192x192.png",
    "512": "./icons/active/android-chrome-512x512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "josueperezparejo@gmail.com"
    }
  },
  "permissions": [
    "storage",
    "scripting"
  ],
  "host_permissions": [
    "*://co.computrabajo.com/*",
    "*://www.linkedin.com/*"
  ],
  "action": {
    "default_title": "Job Defender",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "./icons/active/favicon-16x16.png",
      "32": "./icons/active/favicon-32x32.png",
      "192": "./icons/active/android-chrome-192x192.png",
      "512": "./icons/active/android-chrome-512x512.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://co.computrabajo.com/*",
        "*://www.linkedin.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}