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This text:"your localized menuitem" inserted in my Tools menu. What is it? and how remove it?

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This text have red color and inserted in Tools menu. When I click it show message box: in title show: Hello in cadre show alarm icon and this text: Hello World!

This text have '''red color''' and inserted in '''Tools''' menu. When I click it show message box: in title show: Hello in cadre show alarm icon and this text: Hello World!

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You need to figure out which addon is causing that and get rid of it.

http://support.mozilla.com/en-US/kb/troubleshooting+extensions+and+themes