User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:17.0) Gecko/17.0 Firefox/17.0 Build ID: 20120813150150 Steps to reproduce: Running Firefox Nightly on Mac OS 10.8.0 (Mountain Lion) in 32-bit mode, hardware acceleration is not supported. The relevant section of about:support says: Graphics Vendor ID: 0x10de Device ID: 0x fd5 WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce GT 650M OpenGL Engine -- 2.1 NVIDIA-8.0.51 GPU Accelerated Windows: 0 Azure Canvas Backend: quartz Azure Fallback Canvas Backend: none Azure Content Backend: none even though I have "Use hardware acceleration when available" checked in my Firefox preferences. On the contrary, the about:support window in 64-bit mode says: Graphics Vendor ID: 0x10de Device ID: 0x fd5 WebGL Renderer: NVIDIA Corporation -- NVIDIA GeForce GT 650M OpenGL Engine -- 2.1 NVIDIA-8.0.51 GPU Accelerated Windows: 1/1 OpenGL AzureCanvasBackend: quartz AzureFallbackCanvasBackend: none AzureContentBackend: none

We explicitly don't support OpenGL in 32-bit mode, because 32-bit mode supports QuickDraw plugins that don't draw correctly with hardware acceleration. Sorry!