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I need to block a bad website

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when I open a new tab it goes to a bad site (according to mcafee) how do I block this site and/or change what site comes up when you open a new tab??

when I open a new tab it goes to a bad site (according to mcafee) how do I block this site and/or change what site comes up when you open a new tab??

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By default Firefox opens a blank page in a new Tab, something you installed changed that action. You need to figure out what changed that.

Do you have that problem when running in the Firefox SafeMode?
http://support.mozilla.com/en-US/kb/Safe+Mode
Don't select anything right now, just use "Continue in SafeMode."

If not, see this:
http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+theme...