Joined July 2013
- Tweets 1,998
- Following 44
- Followers 44,460
- Likes 1,904
259 Photos and videos
Firefox DevTools retweeted
15 Dec 2025
🚀 A bunch of #WebDriver features and fixes landed in Firefox 146. WebDriver is the W3C standard for interoperable browser automation, for things like testing tools, and MCPs.
Keep up to date with all the progress here:
fxdx.dev/firefox-webdriver-n…
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Firefox DevTools retweeted
12 Dec 2025
In Firefox 146 DevTools, long lists of unused CSS custom properties collapse, decluttering the UI, and improving performance
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Firefox DevTools retweeted
10 Dec 2025
A bunch of web platform features and bug fixes landed in Firefox 146. There'll be more videos about the highlights soon, but in the meantime, here's a summary: developer.mozilla.org/en-US/…
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Firefox DevTools retweeted
9 Dec 2025
CSS @scope has landed in Firefox 146, making it a new baseline feature. Here's how it works:
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Firefox DevTools retweeted
1 Dec 2025
We have Custom Elements, but do we also need Custom Attributes?
This was discussed at TPAC. Is it something you'd like on the platform?
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12 Nov 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
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Firefox DevTools retweeted
27 Oct 2025
Last week I posted about a secret config in Firefox that made view transitions easier to debug.
@SailorPsy said we should make it less secret.
So we did.
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21 Oct 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 retweeted
20 Oct 2025
We're currently working on devtools for view transitions in Firefox, but in the meantime, here's a little-known option that helps…
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14 Oct 2025
🦊 Firefox 144 adds the screen orientation and timezone override commands the downloadWillBegin event to WebDriver BiDi! fxdx.dev/firefox-webdriver-n…
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Firefox DevTools retweeted
9 Oct 2025
There are… a lot of proposals, but you don't need to rank them all. Skim through the list, and find the few you really care about.
This is an experiment, so we're also interested in feedback on the app itself, and things we can improve for next year.
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Firefox DevTools retweeted
9 Oct 2025
As an experiment, we (the Firefox team) wanted to try a new way to get feedback on which Interop proposals matter most.
So, here's a web app where you can rank the proposals you care about, giving us data we can use when reviewing which ones to champion.
interop-rank.jakearchibald.c…
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17 Sep 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-webdriver-n… !
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19 Aug 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-webdriver-n… 🚀
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23 Jul 2025
🦊 Freshly released Firefox 141 comes with a few WebDriver updates. Setup a proxy for a container with browser.createUserContext, monitor history API usage with browsingContext.historyUpdated. And also a few changes around Cookies.
Read more at fxdx.dev/firefox-webdriver-n… 🚀
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Firefox DevTools retweeted
16 Jul 2025
A little while ago I added a little quality of life feature to @FirefoxDevTools . Now the network filter query persists between devtools instances! (you used to have to type it out every time)
ticket: bugzilla.mozilla.org/show_bu…
before & after:
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24 Jun 2025
🦊 In Firefox 140, WebDriver BiDi allows to override certificates security settings per container and supports a new "navigationCommitted" event. This release also brings a few fixes for action simulation.
More details at fxdx.dev/firefox-webdriver-n… 🚀
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13 Jun 2025
State of CSS 2025 is now open: stateofcss.com/
Browser vendors use the results of 'State of' surveys to help prioritize the features to work on.
If you care about CSS, please take some time to answer it, and help shape the future of the language
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12 Jun 2025
Oops, we forgot to share the WebDriver news for Firefox 138! WebDriver BiDi now lets you install unsigned extensions and allows to set a default viewport for user contexts: fxdx.dev/firefox-webdriver-n… #Firefox #WebDriver #WebDev
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