Firefox 39.0 Smooth Scrolling Screen Tearing

-Gigabyte GA-Z87M-D3H LGA 1150 CrossFireX DVI/HDMI mATX
-Intel Core i7-4770K Haswell 3.5GHz
-16GB (2x8GB) CORSAIR Vengeance LP SDRAM DDR3 1600 (PC3 12800)
-GeForce GTX 760 (4GB 256-bit GDDR5)
-SanDisk Extreme II 240 GB SATA 6.0Gb/s 2.5" SSD
-HGST Deskstar NAS 3.5-Inch 4TB 7200RPM SATA III 64MB Cache
-Pioneer BDR-209DBK 16x Blu-Ray/CD/DVD Writer
-Win7Pro x64 SP1

No change with VSync enabled in NVidia Control Panel. Appears to be a recurring problem with many versions of Firefox. Seeking solutions other than changing browsers.

Ready to provide any additional info upon request.