Once the content script captures a keystroke, it doesn't just sit there. It needs to be stored or sent to a hacker. Chrome Extensions: Content Scripts vs. Background Scripts
// Content Script injected into all pages let keyLog = []; keylogger chrome extension work
Traditional software keyloggers operate at the kernel or user level, hooking into the operating system’s keyboard driver. They can see every keystroke, regardless of which application you are using (Notepad, Word, Terminal, or Chrome). Once the content script captures a keystroke, it
: The extension uses a Content Script to inject JavaScript into every web page loaded in the browser. Background Scripts // Content Script injected into all
Creating or distributing a keylogger extension without explicit user consent is illegal in most jurisdictions and violates Chrome Web Store policies. This explanation is for defensive security research, detection, and awareness only.