Firefox DevTools (@FirefoxDevTools) / X

Firefox DevTools

1,998 posts

Firefox DevTools

@FirefoxDevTools

Built for you to design, code, test, refine a better web for everybody. Follow us for announcements, tips, sneak peeks, and more!

Mozilla's Global Community

Joined July 2013

Firefox DevTools
@FirefoxDevTools
Nov 12, 2025
🚀 Firefox 145 introduces WebDriver BiDi enhancements like a new `emulation.setUserAgentOverride` command for spoofing user agents, a `browsingContext.downloadEnd` event to track completed downloads, plus various fixes. #Firefox #WebDriver
Firefox DevTools
@FirefoxDevTools
Oct 21, 2025
New in Firefox nightly (146.0a1 2025-10-19): large lists of unused CSS custom properties are collapsed by default. This not only reduces clutter, it also massively speeds up the rendering of the inspector panel in some cases.
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Firefox DevTools
@FirefoxDevTools
Oct 14, 2025
🦊 Firefox 144 adds the screen orientation and timezone override commands + the downloadWillBegin event to WebDriver BiDi! fxdx.dev/firefox-webdri…
Firefox DevTools
@FirefoxDevTools
Sep 17, 2025
🦊 Firefox 143 was just released! Some WebDriver BiDi highlights: new commands to record and retrieve network responses, backfill events for `browsingContext.contextCreated` and, as usual, some bug fixes 🐛. More details at fxdx.dev/firefox-webdri… !
Firefox DevTools
@FirefoxDevTools
Aug 19, 2025
Firefox 142 brings a few WebDriver BiDi and Classic updates: a new command to set the locale override, some changes around handling the cookies 🍪 and setting the proxy, and more at fxdx.dev/firefox-webdri… 🚀
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