stephen % apitrace trace -a egl -o ~/fx.trace firefox
apitrace: loaded into /usr/bin/apitrace
apitrace: unloaded from /usr/bin/apitrace
apitrace: loaded into /usr/bin/bash
apitrace: loaded into /usr/lib/firefox/firefox
Crash Annotation GraphicsCriticalError: |[0][GFX1-]: No GPUs detected via PCI (t=0.52878) [GFX1-]: No GPUs detected via PCI
apitrace: loaded into /usr/lib/firefox/firefox
apitrace: loaded into /usr/lib/firefox/firefox
apitrace: loaded into /usr/lib/firefox/firefox
apitrace: loaded into /usr/lib/firefox/firefox
apitrace: loaded into /usr/lib/firefox/firefox
apitrace: redirecting dlopen("libEGL.so", 0x1) from /usr/lib/libnspr4.so
apitrace: redirecting dlopen("libGLESv2.so", 0x1) from /usr/lib/libnspr4.so
apitrace: tracing to /home/stephen/fx.trace
error: could not open /home/stephen/fx.trace for writing
apitrace: error: failed to open /home/stephen/fx.trace
apitrace: loaded into /usr/lib/firefox/firefox
apitrace: loaded into /usr/lib/firefox/pingsender
apitrace: loaded into /usr/lib/firefox/pingsender