>There certainly is hardware acceleration in Firefox on Linux, more then likely it has been disabaled because of your configueration/set-up/drivers. To turn it on go into your "about:config" and toggle the entry "layers.acceleration.force-enabled" to "True" and restart.

Implying that it wasn't deliberately disabled. HW acceleration on Linux isn't enabled by default, and for good reason. Until those underlying reasons are changed, Linux does have a hardware-acceleration-on-Firefox problem.