Firefox 142 Released: Browser Extensions Now Support Local AI Language Models

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Published inAI News · 4 min read · Aug 19, 2025

Mozilla Firefox 142.0 version is now officially released and will be available to the public on Tuesday. Although this version does not bring many eye-catching new features, it may spark widespread discussions regarding its extensibility.

In this version, Firefox 142 has improved support for dragging and dropping Blob images, providing a smoother experience when performing operations. Additionally, the scrolling speed of the bookmarks dialog has been enhanced, making it more convenient for users to manage their bookmarks. These small improvements enhance the user experience.

For web developers, Firefox 142 introduces the Prioritized Task Scheduling API, allowing developers to better control task priorities. Additionally, the new URLPattern API has been included, enabling developers to use standardized pattern syntax to match and parse URLs. These technical updates provide developers with more tools to build efficient web applications.

Notably, Firefox 142 allows browser extensions to use local large language models (LLMs) for the first time. This change may cause some debate among users and developers. The new version supports the wllama API extension, allowing developers to directly integrate the functionality of local language models into their add-ons. The wllama project provides WebAssembly bindings for Llama.cpp, enabling LLM inference in the browser. This feature undoubtedly opens up new possibilities for Firefox extensions.

Users who are confused about using the wllama API can find more information in the "Enable wllama for extensions" section of Firefox's error tracker. The installation files for Firefox 142.0 can be downloaded from ftp.mozilla.org, and detailed information about developer changes can be found at development.mozilla.org.

Although this update is not particularly impressive, Firefox 142 is still an important version worth noting due to its improvements in user experience and developer tools.

Version: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/142

Key points:
🌐 The Firefox 142.0 version is officially released, bringing multiple user experience improvements.
🛠️ New Prioritized Task Scheduling API and URLPattern API have been added, providing developers with more tools.
🤖 For the first time, local large language models (LLMs) are supported, which may spark discussions among extensions.

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