Hi Susan! <!-- Firefox "Safe Mode" is now "Troubleshoot Mode" in Firefox version 88 and above. --> It's possible that this may be caused by some sort of malicious add-on, so '''try Firefox Troubleshoot Mode''' to see if the problem goes away. Firefox Troubleshoot Mode is a special diagnostic mode that temporarily turns off hardware acceleration, disables add-ons (extensions and themes) and resets some settings. See the [[Diagnose Firefox issues using Troubleshoot Mode]] article for details. '''If Firefox is open,''' you can restart in Firefox Troubleshoot Mode from the Help menu: * Click the menu button [[Image:Fx57Menu]], click ''Help'', select ''Troubleshoot Mode'' and click ''Restart'' in the "Restart Firefox in Troubleshoot Mode?" dialog that opens. '''If Firefox is not running,''' you can start Firefox in Troubleshoot Mode as follows: * On Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut. * On Mac: Hold the '''option''' key while starting Firefox. * On Linux: Quit Firefox, go to your Terminal and run ''firefox -safe-mode'' <br>(you may need to specify the Firefox installation path e.g. /usr/lib/firefox) When the Firefox Troubleshoot Mode window appears, select "Open". ;[[Image:Fx88TroubleshootMode]] Let us know if this issue with your emails appears when you're in Troubleshoot Mode. '''''If the issue is not present in Firefox Troubleshoot Mode''''', your problem is probably caused by an extension, theme or hardware acceleration. Please follow the steps in the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article to find the cause. ''To exit Firefox Troubleshoot Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again. (If you can't exit Firefox Troubleshoot Mode, please see [[Firefox is stuck in Troubleshoot Mode]]).'' When you figure out what's causing your issue, please let us know as it might help others with the same problem.