Hello, Please open Firefox in Safe Mode and see if the problem still occurs. You can launch Firefox into Safe Mode directly by holding down the Shift key when opening Firefox. Click the 'Start in Safe Mode' button. NOT the 'Reset' button. [[Troubleshoot Firefox issues using Safe Mode]] If the problem does not occur in Safe Mode then come out of safe mode and then continue following the instructions to identify the setting or add-on that is causing the problem. I would start by disabling hardware acceleration to see if that is the cause. If the problem does occur in Safe Mode then I suggest doing a Firefox Reset. This will return Firefox to its default settings. You personal information will be saved (bookmarks etc) but you will need to reinstall your add-ons. [[Reset Firefox – easily fix most problems]] I hope this helps. Let me know if not.