Examine source code of LinkPin – Bookmark Manager & New Tab Page

{
  "manifest_version" : 3 ,
  "name" : "LinkPin – Bookmark Manager & New Tab Page",
  "short_name" : "LinkPin",
  "description" : "Save tabs in one click, organize bookmarks into topics, and find any link instantly from a beautiful new tab. Private, no account.",
  "permissions" : [
    "activeTab" ,
    "storage" ,
    "contextMenus" ,
    "tabGroups" 
  ],
  "optional_permissions" : [
    "tabs" ,
    "bookmarks" 
  ],
  "optional_host_permissions" : [
    "https://*/*" ,
    "http://*/*" 
  ],
  "action" : {
    "default_popup" : "popup.html",
    "default_title" : "Pin this tab (Alt+Shift+L)",
    "default_icon" : {
      "16" : "icons/icon-16.png",
      "32" : "icons/icon-32.png",
      "48" : "icons/icon-48.png",
      "128" : "icons/icon-128.png"
    }
  },
  "commands" : {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+Shift+L"
      },
      "description" : "Pin the current tab"
    }
  },
  "icons" : {
    "16" : "icons/icon-16.png",
    "32" : "icons/icon-32.png",
    "48" : "icons/icon-48.png",
    "128" : "icons/icon-128.png"
  },
  "content_security_policy" : {
    "extension_pages": "default-src 'self'; style-src 'self' 'unsafe-inline'; font-src 'self'; script-src 'self'; object-src 'none'; img-src 'self' https: data: chrome-extension:; connect-src 'self' https: http:;"
  },
  "chrome_url_overrides" : {
    "newtab" : "newtab.html"
  },
  "version" : "1.4.0",
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "linkpin@nadesoft.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}