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I HAVE A BOX THAT COMES UP EVERYTIME I WANT TO LEAVE A PAGE

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EVERY TIME I WANT TO LEAVE A PAGE A BOX COMES UP AND IT SAYS ARE YOU SURE YOU WANT TO NAVIGATE AWAY FROM THIS PAGE CLICK OK TO CONTINUE OR CANCEL TO STAY ON CURRENT PAGE AND I CANT GET RID OF IT

EVERY TIME I WANT TO LEAVE A PAGE A BOX COMES UP AND IT SAYS ARE YOU SURE YOU WANT TO NAVIGATE AWAY FROM THIS PAGE CLICK OK TO CONTINUE OR CANCEL TO STAY ON CURRENT PAGE AND I CANT GET RID OF IT

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You can close the tab by temporarily disabling JavaScript.

In the Tools menu select Options to open the Options dialog. In the Options dialog select the Content panel, then de-select the "Enable JavaScript" setting. Close the Options dialog, and you should then be able to close the tab. You can re-enable JavaScript afterwards.

Note, Firefox 4 will give an option to stop displaying the alert dialog boxes in situations like this, so you will be able to close the tab without disabling JavaScript.

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Such an alert is done via JavaScript.
If it happens on every page then you may have malware.
If it only happens on specific pages then it can be a script on that page.

You can disable JavaScript temporarily to make it possible to close that tab and then re-enable JavaScript.

Tools > Options > Content : [-] Enable JavaScript

See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked