While Firefox 85 introduced a couple of new privacy features, Firefox 86 promises some other cool changes, such as basic support for the AV1 Image File Format (AVIF), a powerful, lossless, royalty-free and open-source image file format designed to encode AV1 bitstreams in the HEIF (High Efficiency Image File Format) container, enabled by default. Basic support means that advanced features like animated images and colorspace support aren’t supported at this time. AVIF support landed in Firefox a few months ago, but only now it’s enabled by default as Mozilla considers it ready for the masses. Therefor, you could enable AVIF support in previous Firefox release by setting the image.avif.enable option in about:config to true.