Firefox fails on .tabs('load', ...) after .tabs('url', ...)

The provided html with a very simple data.html in the same directory works differently in Firefox, Chrome and Eclipse's web preview.

Requires:

• http://jsfiddle.net/thZwp/
• data.html in the same directory

Expected:

• when clicking the link, data.html should be loaded in the second tab of the top tabs
• it should raise alert boxes with the following texts and order: beforesend, success, complete

What happens?

Firefox:

• beforesend is raised
• a traceback is shown in Firebug

Chromium

• beforesend, error and complete are raised

Eclipse:

• beforesend, success, complete are raised
• the contents of data.html is shown in "Fül2", but its height is not modified.