I would imagine it's due to driver support on Linux. A lot of the open drivers still have issues with 3D acceleration (nouveau for instance). By disabling accel

I would imagine it's due to driver support on Linux. A lot of the open drivers still have issues with 3D acceleration (nouveau for instance). By disabling acceleration in the browser, they minimize unnecessary bug reports and user complaints. Most linux users are competent enough to enable it if they desire.