It works well Rated 5 out of 5 stars
It's not one of the high tier extensions, but it fulfills what its purpose calls for and does it well.
I hope to see Firefox 3 support soon.
So far the core functionalities works for Firefox 3, but the toolbar icon lost its ability to switch between its 2 icons to indicate the 2 states of this extension.
rating: 4.9 / 5
Version reviewed: Switch Window Mode 0.3
Fx 3 RC2