Examine source code of Block Sites

{
  "manifest_version" : 3 ,
  "name" : "Blocking Sites",
  "version" : "1.2.1",
  "description" : "Block distracting sites and distracting features inside them, on your schedule.",
  "icons" : {
    "16" : "icons/icon16.png",
    "32" : "icons/icon32.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "action" : {
    "default_icon" : {
      "16" : "icons/icon16.png",
      "32" : "icons/icon32.png"
    },
    "default_title" : "Blocking Sites"
  },
  "background" : {
    "scripts" : [
      "background/background.js" 
    ],
    "type" : "module" 
  },
  "permissions" : [
    "storage" ,
    "alarms" ,
    "contextMenus" ,
    "declarativeNetRequest" ,
    "declarativeNetRequestFeedback" ,
    "webNavigation" ,
    "tabs" 
  ],
  "host_permissions" : [
    "<all_urls>" 
  ],
  "content_scripts" : [
    {
      "matches" : [
        "*://*.youtube.com/*" 
      ],
      "js" : [
        "content-scripts/common.js" ,
        "content-scripts/youtube.js" 
      ],
      "css" : [
        "content-scripts/bw-mode.css" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : false 
    },
    {
      "matches" : [
        "*://*.tiktok.com/*" 
      ],
      "js" : [
        "content-scripts/common.js" ,
        "content-scripts/tiktok.js" 
      ],
      "css" : [
        "content-scripts/bw-mode.css" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : false 
    },
    {
      "matches" : [
        "*://*.instagram.com/*" 
      ],
      "js" : [
        "content-scripts/common.js" ,
        "content-scripts/instagram.js" 
      ],
      "css" : [
        "content-scripts/bw-mode.css" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : false 
    },
    {
      "matches" : [
        "*://*.facebook.com/*" 
      ],
      "js" : [
        "content-scripts/common.js" ,
        "content-scripts/facebook.js" 
      ],
      "css" : [
        "content-scripts/bw-mode.css" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : false 
    },
    {
      "matches" : [
        "*://*.x.com/*" ,
        "*://*.twitter.com/*" 
      ],
      "js" : [
        "content-scripts/common.js" ,
        "content-scripts/x.js" 
      ],
      "css" : [
        "content-scripts/bw-mode.css" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : false 
    },
    {
      "matches" : [
        "*://*.snapchat.com/*" 
      ],
      "js" : [
        "content-scripts/common.js" ,
        "content-scripts/snapchat.js" 
      ],
      "css" : [
        "content-scripts/bw-mode.css" 
      ],
      "run_at" : "document_start" ,
      "all_frames" : false 
    }
  ],
  "web_accessible_resources" : [
    {
      "resources" : [
        "block-page/block.html" ,
        "shared/*" ,
        "icons/*" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "blocking-sites@local.extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}