For users using the MesaVAGallium 3D state tracker (such as Radeon graphics cards), Intel VA-API driver, NVIDIA VA-API transcoding, or similar Video Acceleration API implementation, you can now enjoy accelerated H.265/HEVC content using Firefox on Linux.
Firefox 137 also adds support for the text-decoration-lineCSS property to account for misspellings and grammatical errors, new JavaScript APIs, SVG additions, and various other changes.
For more background information, see Firefox 137 for Developers.
Firefox version 137.0 binaries are available from Mozilla.org.