Examine source code of Reddit Comment Collapser

{
  "version" : "7.0.1",
  "manifest_version" : 3 ,
  "browser_specific_settings": {
    "gecko": {
      "id": "{a5b2e636-07e5-4331-93c1-6cf4074356c8}"
    }
  },
  "minimum_chrome_version" : "88",
  "name" : "Reddit Comment Collapser",
  "description" : "An easier way to collapse and get around comment threads on old and new Reddit.",
  "icons" : {
    "48" : "image/icon48.png",
    "128" : "image/icon128.png"
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://*.reddit.com/*" 
      ],
      "css" : [
        "css/old-reddit.css" 
      ],
      "js" : [
        "js/old-reddit.js" 
      ],
      "run_at" : "document_start" 
    },
    {
      "matches" : [
        "https://*.reddit.com/*" 
      ],
      "js" : [
        "js/new-reddit.js" 
      ],
      "run_at" : "document_start" 
    }
  ],
  "web_accessible_resources" : [
    {
      "resources" : [
        "image/collapse.png" ,
        "image/collapse-dark.png" ,
        "image/expand.png" ,
        "image/expand-dark.png" ,
        "image/colours/*" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    }
  ],
  "permissions" : [
    "storage" 
  ],
  "options_ui" : {
    "page": "views/options.html" 
  },
  "host_permissions" : [
    "https://*.reddit.com/" 
  ]
}