Firefox 155 release notes for developers (Beta)

Changes for web developers

APIs

DOM

• The SVGAElement interface now implements the HyperlinkElementUtils mixin. As a result, SVG <a> elements expose the same URL component properties as HTML <a> elements: protocol, username, password, host, hostname, port, pathname, search, and hash. The read-only origin property is also exposed. (Firefox bug 2058578).
• The SVGNumberList, SVGPointList, SVGStringList, and SVGTransformList interfaces now support indexed setters. This means you can replace an item in the list using bracket notation, such as transformList[0] = newTransform, instead of calling replaceItem(). The SVGLengthList interface already supports indexed setters. (Firefox bug 2059426).

Media, WebRTC, and Web Audio

• The error event fired on an RTCDataChannel object may now report sctp-failure in its error.errorDetail property if the transport is closed due to an error. In addition, RTCError and RTCErrorEvent are now available in dedicated workers (this exposure is not yet in the specification). (Firefox bug 1814460).

Changes for add-on developers

Experimental web features

These features are shipping in Firefox 155 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.