Firefox 103 for developers

This article provides information about the changes in Firefox 103 that will affect developers. Firefox 103 was released on July 26, 2022.

Changes for web developers

HTML

Removals

MathML

Removals

  • The deprecated scriptminsize and scriptsizemultiplier attributes have been removed (bug 1772697).

CSS

  • The backdrop-filter property (which can be used to apply graphical effects such as blurring or color shifting to the area behind an element) is now available by default. It was earlier behind a preference setting (bug 1578503).
  • The scroll-snap-stop property is now available (bug 1312165). You can use this property's always and normal values to specify whether or not to pass the snap points, even when scrolling fast.
  • Support has been added for the :modal pseudo class. It selects all elements that are in a state in which they exclude all interaction with other elements until the interaction has been dismissed (bug 1768535).

Removals

JavaScript

Removals

HTTP

Removals

Security

Removals

APIs

DOM

Media, WebRTC, and Web Audio

Removals

WebAssembly

Removals

WebDriver conformance (WebDriver BiDi, Marionette)

WebDriver BiDi

  • Added a preference to disable experimental BiDi commands and events remote.experimental.enabled (bug 1777951).
  • Added a script module with an experimental implementation of the evaluate command. Only available if remote.experimental.enabled is set to true (bug 1742979).
  • Added serialization support for collections with simple values and complex objects, used for instance for the event data of log.entryAdded or the return value of script.evaluate (bug 1770752).
  • Fixed an edge case for browsingContext.navigate when navigating to a cached image (bug 1763133).

Marionette

  • Updated the platformVersion capability to be returned as moz:platformVersion (bug 1771760).
  • Removed support for ChromeElement; all elements are now serialized as WebElement (bug 1775036 and bug 1775064).

Changes for add-on developers

Removals

  • Removed the ServiceWorker API in WebExtensions ('serviceWorker' in navigator now returns false when run inside an extension). (bug 1593931)

Other

Older versions