Firefox 141 for developers

• The HTML webkitdirectory attribute and the corresponding HTMLInputElement.webkitdirectory property are now supported on Firefox Android. The attribute can be set to indicate that an <input type="file"> element should offer selection of directories instead of files. (Firefox bug 1887878).

Removals

Removals

Removals

Removals

• The "cache" directive of the Clear-Site-Data response header now clears the bfcache (backwards-forwards cache). 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).

Removals

Removals

• The closedBy attribute of the HTMLDialogElement interface, and corresponding closedby attribute of the <dialog> element, are supported. Developers can use these to specify what mechanisms are able to close the dialogs, such as user interaction outside the dialog ("light dismiss") or programmatic closing. (Firefox bug 1964078).

DOM

Media, WebRTC, and Web Audio

Removals

Removals

General

WebDriver BiDi

Marionette

• Adds the i18n.getPreferredSystemLanguages method to retrieve the preferred locales of the operating system. This complements i18n.getAcceptLanguages which return details of the locales set in the browser. (Firefox bug 1888486)

These features are shipping in Firefox 141 but are disabled by default. To experiment with them, search for the appropriate preference on the about:config page and set it to true. You can find more such features on the Experimental features page.