Comment # 1 on bug 107516 from Mike

Possibly related to bugs 107384 and/or 98629.

If firefox start with LIBGL_DEBUG=verbose parameter, it shows:
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: unable to load driver: amdgpu_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: amdgpu

I.e. it cannot retrieve device info (and name of driver as "radeonsi"), trying
to load non-existant amdgpu_dri.so, then fallbacks to swrast_dri.so