If the problem does not happen in Safe Mode, it is most likely because of an extension, theme or hardware acceleration.

Click the menu button and then click Exit Quit. Click the Firefox menu , then click Exit.

A first step in troubleshooting

Click the Firefox menu at the top of the screen, then click Quit Firefox. Click the Firefox menu , then click Quit.

Based on information from Safe mode mozillaZine KB. Was this article helpful? Home Firefox Fix slowness, crashing, Procedures to diagnose and Troubleshoot Firefox issues using Safe Mode. It functions much like Safe Mode in Windows.

The idea is that when the program starts with its default settings only, it's more likely to start without issues and let you further troubleshoot the problem. What typically happens is that once the program begins without loading custom settings, modifications, add-ons, extensions, etc. Some smartphones can be started in Safe Mode, too. You should check your specific phone's manual since it's usually not obvious how to do it.

Some might have you press and hold the menu button while the phone starts, or maybe both the volume up and volume down keys. Some phones make you hold down the power off option to reveal the Safe Mode switch.

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It's activated by holding down the Shift key while powering on the computer. You can also use Microsoft Outlook in safe mode.

Doing that disables Reading Pane, extensions, and some custom settings so that you can troubleshoot what's preventing Outlook from starting normally. The Firefox web browser is another example of a program that can be started in safe mode for troubleshooting purposes. Share Pin Email. He writes troubleshooting content and is the General Manager of Lifewire. Updated January 05, The picture at the top of this page shows what Safe Mode looks like in Windows Here are descriptions of all three and when to use which:.

Safe Mode. Safe Mode with Networking. Safe Mode with Command Prompt. Continue Reading.

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