Examine source code of LinkedIn Cleaner

{
  "manifest_version": 2,
  "name": "LinkedIn Cleaner",
  "version": "1.0",
  "description": "Remove social content from LinkedIn.",
  "icons": {
    "48": "icons/eraser-48.png",
    "96": "icons/eraser-96.png"
  },
  "permissions": [
    "*://*.linkedin.com/*",
    "tabs",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.linkedin.com/*"
      ],
      "js": [
        "feed.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{0aa18b5e-b507-4ea9-8e73-999eb08e13de}"
    }
  }
}