How to Block Fake Virus Websites in Firefox
Mozilla Firefox attempt to protect you from known web forgeries, which either install viruses/spyware on your computer or trick you into revealing personal information. Enabling this Firefox feature blocks previously reported sites, so they do not have an opportunity to infect your computer. No system is foolproof, so you should maintain good browsing habits by not clicking suspicious links received in emails, nor entering personal information on questionable sites.
Instructions
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Open Mozilla Firefox and press the "Alt" key if the top menu bar is not visible.
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Click "Tools" and select "Options."
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Click the "Security" tab.
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Check "Block Reported Web Forgeries" and "Block Reported Attack Sites." You may also wish to check "Warn Me When Sites Try to Install Add-ons" so that sites cannot install extensions in your browser without permission.
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Click "OK" to enable the features.
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Tips & Warnings
Many anti-virus programs offer a link scanner, which will scan ahead and warn you when dangerous scripting is discovered. Adding such a utility will further protect yourself from dangerous sites.