The biggest new feature of the Firefox 94 release is the enablement of the EGL (OpenGL) API for handling graphics context management on X11 for Intel/AMD users using recent Mesa graphics stacks.
This feature replaces the old GLX implementation and promises to offer a performance boost on Intel/AMD hybrid machines. After upgrading to Firefox 94, Intel/AMD users should notice faster WebGL rendering, more effective rendering, and possibly VA-API video decoding in the near future.