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. Then Firefox is as fast as Chrome or faster, simple as that. Although it would be nice if there was a dialog telling the user their setup is incorrect/unsupported and giving them the option whtout digging into the config, I believe this is the number one reason people think FF is slower, cause their HW acceleration is disabled and they don't even know it is...
>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.