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.
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.
There are simple rules to follow in order to prevent malware from being installed on your computer:
Mac systems tend to be regarded as more secure and, by default, more in control of available software, compared to Windows PCs. These Apple Support documents may be of help:
For information of a more technical nature, this Apple Support article discussion has a comprehensive summary of advice, recommendations and linked articles for Mac users:
The Wikipedia article Linux malware has information and recommendations for Linux users.
Recent Microsoft supported Windows is likely to have basic free anti-virus software built in or available free from Microsoft. If your anti-virus and anti-spyware software hasn't detected malware, scan your system with the free malware scanning programs listed below. You should 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.
You can ask for help in a forum specializing in malware removal, such as those listed below: