@firefoxdevtools.bsky.social
🚀 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 #WebDriver
November 12, 2025 at 6:49 AM
🚀 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 #WebDriver
Reposted
The @firefoxdevtools.bsky.social JSON viewer got better in @firefoxnightly.bsky.social : the console offers access to the original json data via `$json`.
This allows to easily manipulate the underlying data to get what you want
This allows to easily manipulate the underlying data to get what you want
![Firefox JSON Viewer opened for the html entites JSON file
We can see the various properties of the JSON file, which are all objects containing a "characters" and a "codepoints" properties.
The Console is opened at the bottom. In it, we can see a console message explaining that some data is available (`$json.data` - the parsed JSON object, $json.text` - the original JSON text and `$json.headers` - HTTP request and response headers)
There's a console evaluation done with the following snippet:
```js
Object.entries($json.data)
.filter(([k, v]) => v.codepoints.length > 1)
.map(([k, v]) => ({characters: v.characters, htmlEntity: k, codepoints: v.codepoints}))
```
and the result shows an array of objects containing "characters", "htmlEntity" and "codepoints" properties.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:l6jizqbrtfnhnrd7vmsqmi3n/bafkreigizqr72frwj6qa53onh2tskqmcmrydexkzeydrkrarwiuoyulcmq@jpeg)
November 7, 2025 at 11:40 AM
The @firefoxdevtools.bsky.social JSON viewer got better in @firefoxnightly.bsky.social : the console offers access to the original json data via `$json`.
This allows to easily manipulate the underlying data to get what you want
This allows to easily manipulate the underlying data to get what you want
Reposted
Last week I posted about a secret config in Firefox that made view transitions easier to debug.
Folks said we should make it less secret.
So we did.
Folks said we should make it less secret.
So we did.
October 27, 2025 at 10:29 AM
Last week I posted about a secret config in Firefox that made view transitions easier to debug.
Folks said we should make it less secret.
So we did.
Folks said we should make it less secret.
So we did.
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.
This not only reduces clutter, it also massively speeds up the rendering of the inspector panel in some cases.
October 21, 2025 at 12:38 PM
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.
This not only reduces clutter, it also massively speeds up the rendering of the inspector panel in some cases.
Reposted
We're currently working on devtools for view transitions in Firefox, but in the meantime, here's a little-known option that helps…
October 20, 2025 at 2:28 PM
We're currently working on devtools for view transitions in Firefox, but in the meantime, here's a little-known option that helps…
Reposted
Well, isn't this handy! The font inspector in #firefox devtools links to the foundry and shows the license (tsk @ unlicensed trial 🧐)
@firefoxdevtools.bsky.social #fonts
@firefoxdevtools.bsky.social #fonts
October 16, 2025 at 9:22 AM
Well, isn't this handy! The font inspector in #firefox devtools links to the foundry and shows the license (tsk @ unlicensed trial 🧐)
@firefoxdevtools.bsky.social #fonts
@firefoxdevtools.bsky.social #fonts
Reposted
Firefox 144 now supports INP! 🦊
We just shipped interactionId, the piece that makes Interaction to Next Paint work. It helps browsers connect events from the same interaction and measure how responsive pages really feel.
More here: blog.mozilla.org/performance/...
We just shipped interactionId, the piece that makes Interaction to Next Paint work. It helps browsers connect events from the same interaction and measure how responsive pages really feel.
More here: blog.mozilla.org/performance/...
Firefox 144 ships interactionId for INP – Mozilla Performance
TL;DR Firefox 144 ships PerformanceEventTiming.interactionId, which lets browsers and tools group events that belong to the same user interaction. This property is used to calculate Interaction to Nex...
blog.mozilla.org
October 15, 2025 at 12:46 PM
Firefox 144 now supports INP! 🦊
We just shipped interactionId, the piece that makes Interaction to Next Paint work. It helps browsers connect events from the same interaction and measure how responsive pages really feel.
More here: blog.mozilla.org/performance/...
We just shipped interactionId, the piece that makes Interaction to Next Paint work. It helps browsers connect events from the same interaction and measure how responsive pages really feel.
More here: blog.mozilla.org/performance/...
🦊 Firefox 144 adds the screen orientation and timezone override commands + the downloadWillBegin event to WebDriver BiDi! fxdx.dev/firefox-webd...
Firefox WebDriver Newsletter 144 – Firefox Developer Experience
fxdx.dev
October 14, 2025 at 1:59 PM
🦊 Firefox 144 adds the screen orientation and timezone override commands + the downloadWillBegin event to WebDriver BiDi! fxdx.dev/firefox-webd...
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.com
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.com
Interop Feature Ranking
Rank the web platform features you care most about
interop-rank.jakearchibald.com
October 9, 2025 at 5:00 PM
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.com
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.com
🦊 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-webd... !
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-webd... !
Firefox WebDriver Newsletter 143 – Firefox Developer Experience
fxdx.dev
September 17, 2025 at 7:06 AM
🦊 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-webd... !
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-webd... !
Reposted
Yay! It's the first Firefox release since I've joined the team, so let's take a look at some of the new developer-facing features in Firefox 142… 🧵
August 22, 2025 at 9:55 AM
Yay! It's the first Firefox release since I've joined the team, so let's take a look at some of the new developer-facing features in Firefox 142… 🧵
Reposted
Gecko: Intent to Ship: Command and CommandFor attributes
Gecko: Intent to Ship: Command and CommandFor attributes
Gecko: Intent to Ship: Command and CommandFor attributes
groups.google.com
August 18, 2025 at 12:28 PM
Gecko: Intent to Ship: Command and CommandFor attributes
Reposted
View Transitions are enabled by default in Firefox Nightly, so they're on their way to stable. Give it a test with your current transitions, and give me a shout if anything doesn't look right.
August 21, 2025 at 8:16 AM
View Transitions are enabled by default in Firefox Nightly, so they're on their way to stable. Give it a test with your current transitions, and give me a shout if anything doesn't look right.
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-webd... 🚀
Firefox WebDriver Newsletter 142 – Firefox Developer Experience
fxdx.dev
August 19, 2025 at 3:33 PM
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-webd... 🚀
🦊 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-webd... 🚀
Read more at fxdx.dev/firefox-webd... 🚀
Firefox WebDriver Newsletter 141 – Firefox Developer Experience
fxdx.dev
July 23, 2025 at 8:17 AM
🦊 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-webd... 🚀
Read more at fxdx.dev/firefox-webd... 🚀
🦊 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-webd... 🚀
More details at fxdx.dev/firefox-webd... 🚀
Firefox WebDriver Newsletter 140 – Firefox Developer Experience
fxdx.dev
June 24, 2025 at 4:14 PM
🦊 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-webd... 🚀
More details at fxdx.dev/firefox-webd... 🚀
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
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
Redirecting to: /en-US
stateofcss.com
June 13, 2025 at 8:18 AM
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
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
Reposted
The 2025 State of CSS survey is now open! survey.devographics.com/en-US/survey...
State of CSS 2025
Take the State of CSS survey
survey.devographics.com
June 4, 2025 at 1:45 PM
The 2025 State of CSS survey is now open! survey.devographics.com/en-US/survey...
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-webd...
#Firefox #WebDriver #WebDev
WebDriver BiDi now lets you install unsigned extensions and allows to set a default viewport for user contexts: fxdx.dev/firefox-webd...
#Firefox #WebDriver #WebDev
Firefox WebDriver Newsletter 138 – Firefox Developer Experience
fxdx.dev
June 12, 2025 at 12:56 PM
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-webd...
#Firefox #WebDriver #WebDev
WebDriver BiDi now lets you install unsigned extensions and allows to set a default viewport for user contexts: fxdx.dev/firefox-webd...
#Firefox #WebDriver #WebDev
Firefox 139 introduces geolocation override via WebDriver BiDi!
Now you can easily test location-aware features: fxdx.dev/firefox-webd...
#Firefox #WebDriver #WebDev
Now you can easily test location-aware features: fxdx.dev/firefox-webd...
#Firefox #WebDriver #WebDev
Firefox WebDriver Newsletter 139 – Firefox Developer Experience
fxdx.dev
June 12, 2025 at 12:44 PM
Firefox 139 introduces geolocation override via WebDriver BiDi!
Now you can easily test location-aware features: fxdx.dev/firefox-webd...
#Firefox #WebDriver #WebDev
Now you can easily test location-aware features: fxdx.dev/firefox-webd...
#Firefox #WebDriver #WebDev
CDP is removed in Firefox 141 in favor of WebDriver BiDi.
For details see fxdx.dev/cdp-retireme...
#Firefox #WebDev
For details see fxdx.dev/cdp-retireme...
#Firefox #WebDev
CDP Retirement in Firefox – Firefox Developer Experience
fxdx.dev
June 12, 2025 at 12:32 PM
CDP is removed in Firefox 141 in favor of WebDriver BiDi.
For details see fxdx.dev/cdp-retireme...
#Firefox #WebDev
For details see fxdx.dev/cdp-retireme...
#Firefox #WebDev
Reposted
With @firefox.com 138 just around the corner, did you noticed some of the changes we made in 137?
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
Firefox DevTools Newsletter — 137 – Firefox Developer Experience
fxdx.dev
April 29, 2025 at 12:29 PM
With @firefox.com 138 just around the corner, did you noticed some of the changes we made in 137?
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
With @firefox.com 138 just around the corner, did you noticed some of the changes we made in 137?
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
Firefox DevTools Newsletter — 137 – Firefox Developer Experience
fxdx.dev
April 29, 2025 at 12:29 PM
With @firefox.com 138 just around the corner, did you noticed some of the changes we made in 137?
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
Find out in our latest blog post: fxdx.dev/firefox-devt...
#devtools #html #css #js #network
New for WebDriver BiDi in Firefox 137: commands to install/uninstall web extensions, support for containers with event subscriptions and more at fxdx.dev/firefox-webd...
Firefox WebDriver Newsletter 137 – Firefox Developer Experience
fxdx.dev
April 2, 2025 at 8:02 AM
New for WebDriver BiDi in Firefox 137: commands to install/uninstall web extensions, support for containers with event subscriptions and more at fxdx.dev/firefox-webd...
Firefox 137 is around the corner and I realized I didn't wrote DevTools release post since the beginning of the year 🫣
Let's start with updates in version 134, which brought a few fixes and some nice accessibility improvements: fxdx.dev/firefox-devt...
#firefox #devtools #js #a11y
Let's start with updates in version 134, which brought a few fixes and some nice accessibility improvements: fxdx.dev/firefox-devt...
#firefox #devtools #js #a11y
Firefox DevTools Newsletter — 134 – Firefox Developer Experience
fxdx.dev
March 31, 2025 at 6:50 AM
Firefox 137 is around the corner and I realized I didn't wrote DevTools release post since the beginning of the year 🫣
Let's start with updates in version 134, which brought a few fixes and some nice accessibility improvements: fxdx.dev/firefox-devt...
#firefox #devtools #js #a11y
Let's start with updates in version 134, which brought a few fixes and some nice accessibility improvements: fxdx.dev/firefox-devt...
#firefox #devtools #js #a11y