Examine source code of LinkedIn Simple

{
  "manifest_version": 2,
  "name": "LinkedIn Simple",
  "description": "Delete access to feed in LinkedIn",
  "version": "1.0.0",
  "icons": {
    "16": "16_icon.png"
  },
  "page_action": {
    "default_icon": {
      "16": "16_icon.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.linkedin.com/*"
      ],
      "css": [
        "main.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3e35cf9-9e4c-4826-b103-ccdca28c2f70}"
    }
  }
}