Firefox 116 for developers

This article provides information about the changes in Firefox 115 that affect developers. Firefox 116 is the current Nightly version of Firefox and ships on August 01, 2023.

Changes for web developers

Developer Tools

HTML

Removals

CSS

Removals

JavaScript

Removals

SVG

Removals

HTTP

Removals

Security

Removals

APIs

DOM

Media, WebRTC, and Web Audio

Removals

WebAssembly

Removals

WebDriver conformance (WebDriver BiDi, Marionette)

WebDriver BiDi

Marionette

Changes for add-on developers

The URL of a page visited when an extension is uninstalled, provided in runtime.setUninstallURL, can now be up to 1023 characters instead of 255 (Firefox bug 1835723).
autoDiscardable is now supported in tabs.Tab, tabs.onUpdated, tabs.update, and tabs.query (Firefox bug 1809094).

Removals

Other

Older versions