Mozilla Hacks – the Web developer blog

It isn’t often that new image formats land in browsers.

This is the technical companion to our update on Distilled, “Keeping the web open and private in the bot era.”

Support for Web Serial in Firefox 151 for Desktop Firefox can now connect directly to microcontrollers, development boards, 3D printers, power meters, and other serial-connected hardware from the web.

Two weeks ago we announced that we had identified and fixed an unprecedented number of latent security bugs in Firefox with the help of Claude Mythos Preview and other AI models.

The open web is a critical platform for applications that handle highly sensitive data, from private communications to financial transactions and medical records.

In January, we introduced our Nightly package for RPM-based Linux distributions.

This post is an expanded version of a presentation I gave at the 2025 WebAssembly CG meeting in Munich.

Cross-site scripting (XSS) remains one of the most prevalent vulnerabilities on the web.

The Interop Project is a cross-browser initiative to improve web compatibility in areas that offer the most benefit to both users and developers.

Firefox is now the first and the only browser to deploy fast and comprehensive certificate revocation checking that does not reveal your browsing activity to anyone (not even to Mozilla).

Beginning in version 138, Firefox will offer an alternative to DLL injection for Data Loss Prevention (DLP) deployments in enterprise environments.

Launching Interop 2025 The Interop Project is a collaboration between browser vendors and other platform implementors to provide users and web developers with high quality implementations of the web platform.

Today Mozilla and Filament are releasing Uniffi for React Native, a new tool we’ve been using to build React Native Turbo Modules in Rust, under an open source license.

We’ve just released Llamafile 0.8.14, the latest version of our popular open source AI tool.

Introduction As AI continues to evolve, so do the threats against it.

We’re pleased to announce that, as of version 23, the Puppeteer browser automation library now has first-class support for Firefox.

Process separation is one of the cornerstones of the Firefox security model.

Mozilla’s recently announced Builders program supports projects that advance the cause of open source AI.

As discussed on Mozilla Connect, Firefox 130 will introduce an experimental new capability to automatically generate alt-text for images using a fully private on-device AI model.

When Mozilla’s Innovation group first launched the llamafile project late last year, we were thrilled by the immediate positive response from open source AI developers.