See what landed recently in Firefox Nightly!

Starting with Firefox 133, Firefox follows the model HTML specification for transient user activation more closely in Nightly builds. This change makes popup blocking less strict in cases where previous versions of Firefox were overly aggressive, reducing erroneous blocking prompts.

Implement HEVC hardware support for Windows users.

Starting with Firefox for Android 131, HLS playlist support was deprecated in Nightly builds. Extended testing showed no adverse impact as newer playback technologies have been widely adopted by websites.

Starting with Firefox 133, the Developer Tools debugger editor now uses Codemirror 6 in Firefox Nightly builds. Developer Tools debugger users should see performance improvements with larger files.

Starting with Firefox Nightly 131, support for the non-mandatory options argument to getBBox will get the bounding box of the element, including its stroke (e.g. element.getBBox({"stroke": true})). (Learn more)

Starting with Firefox 133, basic features of contenteditable="plaintext-only" are now supported in Firefox Nightly. Firefox still uses <br> elements for line breaks in contenteditable="plaintext-only" even when white-space is pre, pre-line, or pre-wrap. Therefore, textContent of editing host returns one line text even if there are multiple lines.