Misbehavior on OS X with second screen in Firefox

[JMoVS]

This is a very long standing bug - more than two years. When having tab scope enabled and hovering over a tab, it sometimes will start to invoke a switch of virtual desktops ("Spaces") away from the one with Firefox in it.

[grahamperrin]

Is this still an issue?

If so: with which versions of Firefox and Mac OS X?

[JMoVS]

I'm no longer using tabscope and I worry about its future (it's XUL) and I don't have an external monitor right now.