Usually, these programs gather information on your browsing behavior that serve only the people who designed them and interfere with Firefox. Some unwanted programs also come bundled in software packages. Don't install untrusted software: Some websites offer you software to accelerate your browser, to help you search the Web or to add toolbars that make things Firefox already does.Make sure you are using the latest version of all software you use, either by enabling the software's automatic update feature, if available, or by checking for updates from the software provider and by using the Windows Update feature.

Keep your operating system and other software updated: Installation of malicious software usually takes advantage of known security vulnerabilities in other programs, which may have been patched in later versions.

There are simple rules to follow in order to prevent malware from being installed on your computer: How do I prevent malware from being installed? For more information, see Identify problems caused by third-party modules in Firefox for Windows. These modules are displayed on the Firefox about:third-party page.

The malware may have loaded modules into Firefox.

For more information on customizing Firefox, see Remove a toolbar that has taken over your Firefox search or home page and How to remove the Babylon toolbar, home page and search engine.

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?.

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