Mozilla implemented experimental support for the AVIF image format in Firefox Nightly recently. The feature is not enabled by default in the cutting-edge development version of the web browser but users interested in adding support at the time of writing may do so.
Firefox will render AVIF image files just like any other image format supported by the web browser when it is enabled.
AVIF, also known as AV1 Image File Format, is based on AV1 and uses HEIF as the container and AV1 frames. It is an upcoming format. Many web browsers support the AV1 video format already and work has begun to integrate the image format AVIF as well.
