Screenshot

Steps to reproduce:

1.Open a page with VE
2.Insert an image and a reference
3.Open the Media Settings for the image and include another image
4.Click on the Media Settings icon on the second image that you just inserted
OR
5.Open the reference dialog box
6.Add an image inside
7.Click on the Media Settings icon on the image you just inserted

Observed Result:
In both cases after step 4 and step 7, Media Settings dialog box does not open up
In the console following error appears:
NS_ERROR_NOT_AVAILABLE:

...w Date()).getTime();}});jQuery.ready.promise=function(obj){if(!readyList){readyL...

load.p...034436Z (line 11)

See the screenshot attached

This is happening in FireFox only

Test Environment: https://test2.wikipedia.org/
Browser: FF 25
OS: MAC OS X 10. 8. 5
Page:https://test2.wikipedia.org/w/index.php?title=3rdfebFF&veaction=edit

Version: unspecified
Severity: normal

Attached: