fidzu : thunderbird

WebDriver is a remote control interface that enables introspection and control of user agents. As such, it can help developers to verify that their websites are working and performing well with all major browsers. The protocol is standardized by the W3C and consists of two separate specifications: WebDriver classic (HTTP) and the new WebDriver BiDi (Bi-Directional).

This newsletter gives an overview of the work we've done as part of the Firefox 157 release cycle.

Contributions

Firefox is an open source project, and we are always happy to receive external code contributions to our WebDriver implementation. We want to give special thanks to everyone who filed issues, bugs, and submitted patches.

In Firefox 157, multiple WebDriver bugs were fixed by contributors:

• Sameem merged two internal helpers (remote/shared/Sync.sys.mjs and remote/marionette/sync.sys.mjs), which removed some code duplication.
• Khalid AlHaddad unified the navigation commands in Marionette and WebDriver BiDi to always initiate navigations via browsingContext.loadURI().
• Khalid AlHaddad updated the WebDriver BiDi client used by WebDriver tests so that browsing_context.locate_nodes returns the nodes array directly instead of the enclosing result object, matching the updated command response.

WebDriver code is written in JavaScript, Python, and Rust, so any web developer can contribute! Read how to set up the work environment and check the list of mentored issues for Marionette or the list of mentored JavaScript bugs for WebDriver BiDi. Join our chatroom if you need any help to get started!

All Changes

A complete list of developer-facing changes included in this Firefox release is available in the MDN Firefox 157 Release Notes.

05 Oct 2026 2:21pm GMT

The 2021 SciPy conference (https://www.scipy2021.scipy.org/) involved the showcasing of the latest open source Python projects for advancement in scientific computing. Mozilla was a diversity sponsor and a few Mozillians attended and shared their experience of the event.

02 Oct 2026 4:24am GMT

Will Lachance gives a last lecture on writing data documentation at Mozilla.

02 Oct 2026 3:38am GMT