(Update: video topics page has Nvidia CUDA 8.0.46 with mac OS Sierra support.) New in Release 3.05f01: Includes BETA support for i Mac and Mac Book Pro systems with NVIDIA graphics Release Notes Archive: This driver update is for Mac Pro 5,1 (2010) users.(2009 Mac Pro can run Sierra with the unofficial EFI 5,1 update) BETA support is for i Mac 14,2 / 14,3 (2013), i Mac 13,1 / 13,2 (2012) and Mac Book Pro 11,3 (2013), Mac Book Pro 10,1 (2012), and Mac Book Pro 9,1 (2012) users." (I've added this link to the video topics page which has previous Nvidia driver updates for 10.11.6, 10.10.5, 10.9.5, and the current CUDA version that supports those OS's.) FYI: This and several earlier driver updates list "Beta" support for some i Macs and MBPs (in page post above).
If the problem still occurs, the graphics processor is not the cause.
Firefox and some plugins use your graphics card to help speed up the display of web content.
If the problem goes away, your graphics processor or driver is likely the issue.
See Graphics processor (GPU) troubleshooting for further troubleshooting steps.
Experienced users can download and install the latest motherboard chipset drivers to help resolve rare issues caused by outdated motherboard chipset drivers.
Although it is out of the Scope of Technical Support for Blizzard to assist, you can search on your own for a program that will tell you what type of motherboard you have, then visit the manufacturer’s website for the update.In order to reinstall drivers and files for the latest OS X build, you can download a Combo Update.You can find the latest Combo Update for your operating system located on Apple's Support Download page.A Software Update is an incremental update of the Mac OS and its applications, Security Updates, device drivers, and firmware updates.For Blizzard games, it is important to download and install all software updates, as our games are designed for the latest version of the supported system requirements.If your distribution's standard update process doesn't give you the latest drivers, you may need to look for other package repositories for your distribution.