Using FireFox, open Examples Explorer (https://examples3.ext.net/)
Open two or more examples
Scenario 1
Click with the right button on the header of the active tab. Tab Menu is not shown. It shows up only if if you double-click right button quickly.
Scenario 2
Click with the right button on the header of one inactive tab. The tab is activated and Tab Menu is not shown.
On IE and on Chrome, everything works as expected.
Thanks in advance.