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Firefox 141 release notes (mdn#40530)
* firefox 141 * Update files/en-us/mozilla/firefox/releases/143/index.md * Update files/en-us/mozilla/firefox/releases/142/index.md * Update files/en-us/mozilla/firefox/releases/141/index.md --------- Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>
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‎files/en-us/mozilla/firefox/releases/140/index.md‎

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title: Firefox 140 for developers
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short-title: Firefox 140 (Stable)
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short-title: Firefox 140
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slug: Mozilla/Firefox/Releases/140
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page-type: firefox-release-notes-active
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page-type: firefox-release-notes
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sidebar: firefox
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‎files/en-us/mozilla/firefox/releases/141/index.md‎

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title: Firefox 141 for developers
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short-title: Firefox 141 (Beta)
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short-title: Firefox 141 (Stable)
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slug: Mozilla/Firefox/Releases/141
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page-type: firefox-release-notes-active
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sidebar: firefox
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---
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This article provides information about the changes in Firefox 141 that affect developers.
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Firefox 141 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [July 22, 2025](https://whattrainisitnow.com/release/?version=141).
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> [!NOTE]
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> The release notes for this Firefox version are still a work in progress. You can [view the project tracker for this release here](https://github.com/mdn/mdn/issues/698).
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<!-- Authors: Please uncomment any headings you are writing notes for -->
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Firefox 141 was released on [July 22, 2025](https://whattrainisitnow.com/release/?version=141).
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## Changes for web developers
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<!-- ### Developer Tools -->
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### HTML
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- The HTML [`webkitdirectory`](/en-US/docs/Web/HTML/Reference/Elements/input/file#webkitdirectory) attribute and the corresponding {{domxref("HTMLInputElement.webkitdirectory")}} property are now partially supported on Firefox Android ([Firefox bug 1887878](https://bugzil.la/1887878)).
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The attribute can be set to indicate that an [`<input type="file">`](/en-US/docs/Web/HTML/Reference/Elements/input/file) element should offer selection of directories instead of files.
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Note that the returned file entries for the selected folder always contain an empty string in ({{domxref("File.webkitRelativePath")}}), which means that using `webkitdirectory` is not suitable for use cases where information about the directory structure is needed ([Firefox bug 1973726](https://bugzil.la/1973726)).
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### CSS
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- The CSS {{CSSXRef("font-variant-emoji")}} property allows you to set a default presentation style for displaying emojis ([Firefox bug 1954214](https://bugzil.la/1954214)).
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### JavaScript
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- The [`variants`](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/variants) accessor property is now supported on {{jsxref("Intl.Locale")}} instances.
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This property returns the variants associated with a locale as a string of dash (`-`) separated identifiers.
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It offers a more robust way to get and set variant subtags of a language identifier as opposed to manually parsing or modifying a locale string ([Firefox bug 1970161](https://bugzil.la/1970161)).
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### HTTP
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- The [`"cache"`](/en-US/docs/Web/HTTP/Reference/Headers/Clear-Site-Data#cache) directive of the {{httpheader("Clear-Site-Data")}} response header now clears the {{glossary("bfcache")}} (backwards-forwards cache).
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This allows a site to ensure that if anyone navigates backward after a user has signed out, private details that were visible during the initial session will not be exposed. ([Firefox bug 1930501](https://bugzil.la/1930501)).
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### APIs
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- The {{domxref("PointerEvent/persistentDeviceId","persistentDeviceId")}} property of the {{domxref("PointerEvent")}} interface is now supported. This gives each pointing device that interacts with the screen a unique ID that persists for the session. It provides a reliable way to identify multiple pointing devices (such as pens) interacting with the screen simultaneously. ([Firefox bug 1968400](https://bugzil.la/1968400)).
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Unlike `showPopover()` and `hidePopover()`, this does not throw an exception if the popover is already in the target state.
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- The [WebGPU API](/en-US/docs/Web/API/WebGPU_API) is now fully supported on Windows, in all contexts except for service workers. This allows developers to perform computation and graphics rendering using the [Graphics Processing Unit](https://en.wikipedia.org/wiki/Graphics_Processing_Unit) (GPU) of a user's computer. ([Firefox bug 1972486](https://bugzil.la/1972486)).
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### WebDriver conformance (WebDriver BiDi, Marionette)
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#### General
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## Changes for add-on developers
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- Adds the {{WebExtAPIRef('i18n.getPreferredSystemLanguages')}} method to retrieve the preferred locales of the operating system. This complements {{WebExtAPIRef('i18n.getAcceptLanguages')}} which return details of the locales set in the browser. ([Firefox bug 1888486](https://bugzil.la/1888486))
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- Adds the {{WebExtAPIRef('i18n.getPreferredSystemLanguages')}} method to retrieve the preferred locales of the operating system. This complements {{WebExtAPIRef('i18n.getAcceptLanguages')}}, which returns details of the locales set in the browser. ([Firefox bug 1888486](https://bugzil.la/1888486))
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## Experimental web features
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‎files/en-us/mozilla/firefox/releases/142/index.md‎

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title: Firefox 142 for developers
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short-title: Firefox 142 (Nightly)
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short-title: Firefox 142 (Beta)
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slug: Mozilla/Firefox/Releases/142
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page-type: firefox-release-notes-active
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sidebar: firefox
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This article provides information about the changes in Firefox 142 that affect developers.
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Firefox 142 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [August 19, 2025](https://whattrainisitnow.com/release/?version=141).
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Firefox 142 is the current [Beta version of Firefox](https://www.firefox.com/en-US/channel/desktop/#beta) and ships on [August 19, 2025](https://whattrainisitnow.com/release/?version=142).
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> [!NOTE]
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> The release notes for this Firefox version are still a work in progress.

‎files/en-us/mozilla/firefox/releases/143/index.md‎

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---
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title: Firefox 143 for developers
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short-title: Firefox 143 (Nightly)
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slug: Mozilla/Firefox/Releases/143
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page-type: firefox-release-notes-active
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sidebar: firefox
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---
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This article provides information about the changes in Firefox 143 that affect developers.
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Firefox 143 is the current [Nightly version of Firefox](https://www.firefox.com/en-US/channel/desktop/#nightly) and ships on [September 16, 2025](https://whattrainisitnow.com/release/?version=143).
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> [!NOTE]
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> The release notes for this Firefox version are still a work in progress.
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<!-- Authors: Please uncomment any headings you are writing notes for -->
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## Changes for web developers
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<!-- ### Developer Tools -->
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## Experimental web features
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These features are shipping in Firefox 143 but are disabled by default.
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To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`.
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You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.

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