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[http://en.wikipedia.org/wiki/Malware Malware] is short for "Malicious Software". It is a term generally used for software installed on your computer that is designed to infiltrate or damage a computer system without the owner's informed consent. Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. This article describes what common symptoms are and how to prevent malware from being installed and get rid of them.

[http://en.wikipedia.org/wiki/Malware Malware] is short for "Malicious Software". It is a term generally used for software installed on your computer that is designed to infiltrate or damage a computer system without the owner's informed consent. Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of. This article describes what common symptoms are and how to prevent malware from being installed and get rid of them. __TOC__ = How do I know that my Firefox problem is a result of malware? = 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. * '''Some ad popups display all the time''', although you've blocked popups. For more info on blocking popups, see [[Pop-up blocker]]. * '''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 info, see [[Searches are redirected to another site]]. * '''Your home page has been hijacked'''. For more info on setting your home page, see [[How to set the home page]]. * '''Firefox never finishes loading or can not load certain websites'''. For more info, see [[Firefox never finishes loading certain websites]] and [[Server not found#w_firefox-cannot-load-certain-websites|Firefox cannot load certain websites]]. *'''Firefox crashes or hangs a lot.''' For more info, see [[Firefox crashes]] and [[Firefox hangs]]. *'''Firefox does not start'''. For more info, see [[Firefox will not start]]. *'''Problems with connecting to Facebook'''. For more info on problems with Facebook, see [[Problems using Facebook in Firefox]]. *'''Firefox keeps opening many tabs or windows'''. For more info, see [[Firefox keeps opening many tabs or windows]]. *'''Unwanted toolbars have been installed'''. For more info on customizing Firefox, see [[How do I customize the toolbars?]] and [[Customizing Firefox with add-ons]]. = How do I prevent malware from being installed? = There are simple rules to follow in order to prevent malware from being installed on your computer: * '''Use the latest version of each piece of software:''' Installation of malicious software usually takes advantage of known security vulnerabilities in other programs, which may have been patched in later versions. Make sure you are using the latest version of each piece of software you use{for win}, including Windows updates{/for}. * '''Don't install untrusted software:''' Some websites offer you software to accelerate your browser, to help you search the Web, to add toolbars that make things Firefox already does. Usually, these programs gather information on your browsing behavior that serve only people who designed them and interfere with Firefox. If you want to install a safe add-on, go to [https://addons.mozilla.org Mozilla's add-on website]. * '''Don't click inside misleading pop-up windows:''' Many malicious websites try to install malware on your system by making images look like pop-up windows, or displaying an animation of the website scanning your computer. For more info on detecting a misleading pop-up, see [[Pop-up blocker]]. * '''Run anti-virus and anti-spyware real-time protection and scan your system periodically.''' Make sure your anti-virus and anti-spyware real-time protection is enabled. Scan your computer at least every month. * '''Don't run a fake Firefox:''' Download Firefox from [http://www.mozilla.com mozilla.com].<!-- Note to localizers: add your local Mozilla website: www.mozilla-europe.org, mozilla.jp, or other depending on your location-->{note}'''Note:''' Please report misuse of the Firefox trademark using the [http://www.mozilla.com/legal/fraud-report/index.html Mozilla Violating Website Report page]{/note} = How do I get rid of malware? = If your anti-virus and anti-spyware software hasn't detected malware, scan your system with other free malware scanning programs. You need to scan with all programs because each program detects different malware and make sure that you update each program to get the latest version of their databases before doing a scan. {for win} * [http://www.malwarebytes.org/mbam.php Malwarebytes' Anti-Malware] * [http://www.superantispyware.com/ SuperAntispyware] {/for} There are also specialized forums for malware removal such as those listed below, where you might be able to get more help: * [http://www.bleepingcomputer.com/forums Bleeping Computer Forums] * [http://www.spywarewarrior.com/index.php Spyware Warrior Forums] * [http://www.spywareinfoforum.com/ SWI Forums]