With Firefox 156 they are promoting their built-in PDF viewer as now starting up to 45% faster. Also on the performance side is improved memory and CPU usage when Firefox is displaying large JPEG images that in turn are scaled down to fit on a web page.

There are also a number of fixes in Firefox 156 like for high-sample-rate FLAC audio in MP4 failing on some websites, fixing various platform-specific issues, and other minor adjustments.

Within the Firefox 156 nightly builds was also enabling Vulkan Video decoding for newer NVIDIA GPUs on recent versions of the NVIDIA driver, but sadly that didn't make it for the Firefox 156 release with it still being gated to nightly builds.

This isn't the most exciting Firefox update for Linux users in recent history, but if wanting this latest update you can grab Firefox 156 right now via ftp.mozilla.org.

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[–] Trainguyrom@reddthat.com 1 points 4 days ago

They added the ability to fill PDF forms a few years ago and much more recently added the ability to rearrange documents, copy/remove pages, etc. but each are kinda difficult to find features if you don't know what to look for