Examine source code of Reddit Multi-Column

{
  "manifest_version" : 3 ,
  "name" : "Reddit Multi-Column",
  "description" : "Displays posts in multiple columns.",
  "version" : "2026.7.6",
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "64" : "icons/icon-64.png",
    "128" : "icons/icon-128.png"
  },
  "permissions" : [
    "storage" 
  ],
  "options_ui" : {
    "page": "popup.html" ,
    "open_in_tab": false
  },
  "content_scripts" : [
    {
      "run_at" : "document_start" ,
      "matches" : [
        "https://www.reddit.com/*" 
      ],
      "js" : [
        "content.js" 
      ],
      "css" : [
        "content.css" 
      ],
      "world" : "MAIN" 
    },
    {
      "run_at" : "document_start" ,
      "matches" : [
        "https://www.reddit.com/*" 
      ],
      "js" : [
        "storage.js" 
      ]
    }
  ],
  "action" : {
    "default_popup" : "popup.html"
  },
  "minimum_chrome_version" : "114",
  "browser_specific_settings": {
    "gecko": {
      "id": "{6998b334-f271-49ad-b989-dcf6e6e8c46a}",
      "strict_min_version": "119.0a1"
    }
  }
}