Firefox users have been advised not to use the browser's automatic password manager.
Mozilla the company that develops Firefox,found that the feature,which stores user names and passwords,is not secure.
A bug report on the Firefox website suggests the tool will also supply passwords to fake sites.
To switch off the password manager in Firefox, go to the Tools menue,click on Options and select the security tab.
Remove the tick from the box marked "Remember passwords for sites"and click ok.
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The user who discovered the problem was sent a link to a fake Myspace page that requested his login details. Although the page was a fake, and not stored on the Myspace servers, Firefox still automatically filled in his details.
For unsuspecting users, this could make it easier to accidentally send details to phishers or other scammers.
The advice from Mozilla, Firefox's maker, is to avoid using the password manager until the problem is fixed.