Unwanted toolbars have been installed.

For more information, see Firefox repeatedly opens empty tabs or windows after you click on a link.

Firefox keeps opening many tabs or windows.

For more information on problems with Facebook, see Fix problems with Facebook games, chat and more. For more information, see Firefox won't start - find solutions. For more information, see Troubleshoot Firefox crashes (closing or quitting unexpectedly) and Firefox hangs or is not responding - How to fix. For more information, see Websites show a spinning wheel and never finish loading and Firefox cannot load certain websites.

Firefox never finishes loading or can't load certain websites.For more information on setting your home page, see How to set the home page. For more information, see What to do when searches take you to the wrong search website. Your searches are redirected to another site in order to feed you content from that website and you are being disallowed from blocking them.

For more information on blocking popups, see Pop-up blocker settings, exceptions and troubleshooting.

Some ad popups display all the time, even though you've blocked popups.

Symptoms are various and depend on the malware, but if you have one or several of these behaviors, you may have malware installed on your computer. How do I know that my Firefox problem is a result of malware?

2 How do I prevent malware from being installed?.

1 How do I know that my Firefox problem is a result of malware?.

You should use malware-scanning software to help identify and eliminate viruses. Stopping a virus altogether involves searching your Mac pretty thoroughly to ensure all traces of the virus are gone. Buy the premium version now to prevent infection in the first place. After 14 days, your trial reverts to a limited disinfection scanner. Download Malwarebytes for Mac (the free version) and you get a 14-day trial of the premium version with automatic (real-time) virus and malware protection. Malware usually gets on your computer when you insta. There is malware for Macs (viruses are just one type of malicious software). However, there are no known viruses for Macs in the wild. Macs can get viruses, just like any programmable computer. But there are steps you can take to further protect yourself. OS X does a pretty good job of stopping viruses and malware from attacking your computer.

Check viruses in my computer