Firefox 130 for developers

This article provides information about the changes in Firefox 130 that affect developers. Firefox 130 was released on September 3, 2024.

Changes for web developers

HTML

CSS

  • The hyphens CSS property is now properly supported for Czech and Slovak languages. Among other things, this ensures that words will will no longer split on syllables (Firefox bug 1908931).

APIs

Removals

WebAssembly

General

  • System add-ons are now completely disabled by default (Firefox bug 1904310).
  • Fixed an issue with the internal prompt listener to correctly select the appropriate user prompt on Android (Firefox bug 1902264).

WebDriver BiDi

  • Added support for the browsingContext.navigationFailed event, which is triggered when a navigation attempt fails to complete (Firefox bug 1846601).
  • The network.setCacheBehavior command now allows defining the network cache behavior both globally and for individual navigables simultaneously (Firefox bug 1905307).
  • The network.responseCompleted and network.fetchErrorevents are now emitted when the actual request stops, eliminating a race condition where browsingContext.domContentLoaded and browsingContext.load events were emitted before the network.responseCompleted event (Firefox bug 1882803).
  • Data URLs (e.g., for background images or fetch requests) are now fully supported across all network events (Firefox bug 1904343).
  • Fixed an issue where the network.authRequired event was sent out multiple times with each call to the network.continueWithAuth command (Firefox bug 1899711).

Marionette

  • Fixed an issue in WebDriver:ElementSendKeys so that it only scrolls the element into view if it is not already visible (Firefox bug 1906095).

Changes for add-on developers

Experimental web features

These features are newly shipped in Firefox 130 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.

Older versions