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Why does user initiated pop-under fails?


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.

Modified by bobyu

Additional System Details

This happened

Every time Firefox opened

This started when...

Firefox 4 was released

Installed Plug-ins

  • ActiveTouch General Plugin Container Version 105
  • Google Talk Plugin Video Accelerator version:
  • Version
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in Web pages. For more information, visit the QuickTime Web site.
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.0
  • Google Update
  • Shockwave Flash 10.3 r181
  • Adobe Shockwave for Director Netscape plug-in, version 11.5
  • Next Generation Java Plug-in 1.6.0_26 for Mozilla browsers
  • Windows Activation Technologies Plugin for Mozilla
  • 4.0.60531.0
  • NVIDIA 3D Vision plugin for Mozilla browsers
  • NVIDIA 3D Vision Streaming plugin for Mozilla browsers


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0

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10776 solutions 96963 answers

Do you have a page with that code to test?

Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).