I think it is a new feature that left/right scrolling (e.g. with an apple mouse) switches between tabs. This is annoying, because it even happens when your focus is not on the tabs, but for example when you just clicked on one of the sub-table (e.g. the Operations tab of MBeans), it is easy to accidentelly scroll a bit left or right, and the complete window changes in front of you, which leaves me a bit baffled everytime it happens.

I'd like the feature to be optional, or removed alltogether.