From what I understand, all of my browsers are up-to-date and should work fine with WebGL. For instance:
Google Chrome: 13.0.782.107
Chromium: 15.0.847.0 (Developer Build 95927 Mac OS X)
So I'm thinking it's my video card. My MacBook is from the summer of 2007 (getting "old"), with an ATI Radeon X1600:
Code :Model Name: MacBook Pro Model Identifier: MacBookPro2,2 Processor Name: Intel Core 2 Duo Processor Speed: 2.33 GHz Number Of Processors: 1 Total Number Of Cores: 2 L2 Cache: 4 MB Memory: 2 GB Bus Speed: 667 MHz ATI Radeon X1600: Chipset Model: ATY,RadeonX1600 Type: GPU Bus: PCIe PCIe Lane Width: x16 VRAM (Total): 256 MB Vendor: ATI (0x1002) Device ID: 0x71c5 Revision ID: 0x0000 ROM Revision: 113-xxxxxx-158 EFI Driver Version: 01.00.158
It seems like once I updated from Leopard to Snow Leopard recently, WebGL stopped working on my machine. I've tried "Software Update" multiple times but haven't been prompted to download a new video driver. And I don't know any other way to update the video drivers for a Mac.