A Chrome extension keylogger is a type of malicious software that records everything you type within your web browser
Here is a minimalist, non-malicious demo that logs only to the console and clears on page reload:
Event Listening: This script adds an "event listener" (like addEventListener('keydown', ...)) to the page’s Document Object Model (DOM). keylogger chrome extension work
How Keylogger Chrome Extensions Work: A Deep Dive into Browser Security
Background Scripts & Storage: Once a keystroke is captured, the content script sends that data to a background script or service worker. This persistent component then stores the data locally (using chrome.storage) or exfiltrates it to an external server via an API request. Permissions Required A Chrome extension keylogger is a type of
to the browser window. Every time you press a key, the extension captures the specific character. Stealthy Logging
Use Chrome’s Security Features:
Chrome’s security model isn’t broken—it’s permission-based. The extension above explicitly asks for host_permissions: ["<all_urls>"]. When you install it, Chrome shows a warning: “Read and change all data on all websites.”