Examine source code of LinkedIn Feed Locker

{
  "manifest_version": 3,
  "name": "LinkedIn Feed Locker",
  "version": "1.0.3",
  "description": "Hides LinkedIn feed until the unlock button is pressed.",
  "permissions": [],
  "icons": {
    "16": "icons/16.png",
    "48": "icons/48.png",
    "128": "icons/128.png",
    "512": "icons/512.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linkedin-feed-locker@valerian.dtdg.fr"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ]
}