There seems to be a bug in media/system/js/modal.js and media/system/js/modal-uncompressed.js which prevents modal boxes from opening in firefox, the fix is noted in the following knowledge-base
Opened On:
4 Mar 2013, 5:59 by Greg Keys
Closed On:
7 Jul 2014, 5:11
Duplicate Report

Filed Under

  • Firefox 6.x
  • Javascript
  • No Platform Implications


Posted on 11 Apr 2013, 16:50 by Valentin Despa
I've tested this in FF 20.0

Added to a template:


And in the body

<a href="#" class="modal">Modal link</a>

And it worked perfectly, no errors in Firebug and the modal opened.

Am am marking this as "Unable to confirm", but if you feel that this bug persists, please come back with more details.

Thanks for your help.
Posted on 6 Nov 2013, 3:13 by T S

I can confirm the problem Greg Keys describes with Joomla Version 2.5.14 and Firefox 24.0 (on Windows 8).
Also this fix ( has solved the problem for me despite a completely different javascript error.

My Console says:

TypeError: Argument 1 of Node.contains does not implement interface Node.



Thank you.
Posted on 4 Mar 2014, 8:24 by Yannick Spang

I can confirm the problem above. The fix solve the issue.
Posted on 7 Jul 2014, 5:04 by Roland Dalmulder

I have updated this bug report for Joomla 3.3 as it is still an issue. A pull request has been created:
Posted on 7 Jul 2014, 5:11 by Roland Dalmulder

Setting this to Duplicate as I can't move it. New tracker is #33927