That looks like a crash in the graphics display driver. Can you start Firefox in Safe mode, that will disable hardware acceleration? In Firefox 4+ versions you can use one of these to start in <u>Safe mode</u>: *Help > Restart with Add-ons Disabled *On Windows, hold down the Shift key while starting Firefox with a double-click on the Firefox desktop shortcut *On Mac, hold down the Options key while starting Firefox *https://support.mozilla.org/kb/Safe+Mode ---- Try to disable hardware acceleration to see if that helps. *Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available" *https://hacks.mozilla.org/2010/09/hardware-acceleration/ If disabling hardware acceleration works then check if there is an update available for your graphics display driver. *https://support.mozilla.org/kb/how-do-i-upgrade-my-graphics-drivers