Could you try starting Firefox in its Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]]. With Firefox fully closed, you can hold down the Shift key when starting Firefox. A small dialog should appear. Click "Start in Safe Mode" (''not'' Reset). Any difference? If Firefox is visible, go ahead and disable Firefox's use of hardware acceleration as a workaround for a possible graphics card driver software incompatibility. "3-bar" menu button (or Tools menu) > Options > Advanced On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available" That will be in effect the next time you exit and start Firefox back up.