Cross-site scripting (XSS) remains one of the most prevalent vulnerabilities on the web. The new standardized Sanitizer API provides a straightforward way for web developers to sanitize untrusted HTML before inserting it into the DOM. Firefox 148 is the first browser to ship this standardized security enhancing API, advancing a safer web for everyone. We expect other browsers to follow soon.

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Firefox 148 is the first browser to ship the standardized Sanitizer API, which provides built-in XSS protection by sanitizing untrusted HTML before DOM insertion. The new `setHTML()` method replaces the error-prone `innerHTML` assignment, stripping dangerous elements and attributes by default. Developers can customize the sanitization configuration for stricter or more permissive rules, and can combine `setHTML()` with Trusted Types for centralized control over HTML injection. This approach requires minimal code changes and no dedicated security team, making XSS prevention accessible to a broader range of developers.

Goodbye innerHTML, Hello setHTML: Stronger XSS Protection in Firefox 148

<p>Making the browser handle sanitization instead of having libraries for that is a great idea!</p>


<p>A great step forwards. Kind of wild that it’s taken this long when you think about it 😬</p>
