In addition.
The problem concerns only the Mozilla Firefox browser.
Opening new tabs middle mouse button when you hover over a hyperlink in a browser:
Internet Explorer v10 – Work
Opera v12.15 – Work
Google Chrome v26.0.1410.64 – Work
Mozilla Firefox v20.0.1 – Not work
Opening the middle mouse button works fine on other sites using Mozilla Firefox, the problem is only T3 Framework. Even the forum page with the middle mouse button works smoothly.
Unfortunately, even in the T3 version 1.2.1, this problem exists, appeared when I cleaned the browser cache. On pages http://t3-framework.org/ T3 Framework Demo Demo J2.5 and J3.0 http://demo.t3-framework.org/joomla25/ http://demo.t3-framework.org/joomla30/problem also occurs (you can see it is only for Mozilla Firefox).
I checked the other computer with clean, the latest version of Mozilla Firefox, and there also was not working to open new tabs with the middle mouse button.