Examine source code of SellScale Browser Extension

{
  "browser_specific_settings": {
    "gecko": {
      "id": "browser-extension@sellscale.com"
    }
  },
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "SellScale Browser Extension",
  "description": "This extension will allow you to easily retrieve your session cookies for LinkedIn and other sites.",
  "version": "1.0.0",
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "action": {
    "default_popup": "index.html",
    "default_title": "Open the popup"
  },
  "short_name": "SellScale Browser Extension",
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/*"
      ],
      "js": [
        "test.js"
      ],
      "css": [
        "test.css"
      ],
      "run_at": "document_end"
    }
  ],
  "host_permissions": [
    "*://*.linkedin.com/*"
  ],
  "permissions": [
    "cookies"
  ]
}