Raise or lower windows: Uncheck this option to make sure scripts cannot raise (bring to the front) or lower (send to the back) windows. 

This is for Firefox 4 and 5. I know that popunders are disabled. I need to enable "Lower or raise windows" setting in the "Advanced Javascript Settings" to make the popunders work function pop_under() { window.blur(); window.opener.focus(); } I understand that it is set to off by default to prevent popunders. But why shouldn't user initiated or user clicked link make the popunder work? Regular users will not know how to change that setting. Is there any rationale behind this? Firefox 4 and 5 are the only ones where there is a draconian measure against the popunder. This text is directly from the help file: Advanced JavaScript Settings Raise or lower windows: '''Uncheck''' this option to make sure scripts cannot raise (bring to the front) or lower (send to the back) windows. The actual behaviour is reversed. I need to check this feature so that the scripts '''can''' raise or lower windows. I believe this is a serious bug that only exists in Firefox 4 and 5.