Running SQuirreL 3.7 with Java 1.7 on Mac OS X 10.10.5
In the General Preferences tab, I disable "Use Scrollable Tabbed Panes" but this has no effect even after restarting the client. The session (and other) tabs remain in a single row scrolling off the sides.
The main reason this drives me crazy, other than the lack of visibility, is that when I am clicking the left arrow to get to earlier opened sessions, the arrow becomes an X when I get to the left end and I too often inadvertantly close the session I was trying to get to.