Rated 4 out of 5 stars

@Gamma Rallyson: Thanks for pointing out the bug. I've been having the same problem for quite some time. Can't say whether it started with Fx 3.0 or 3.5. Restarting Fx is the only way out. I always thought it was some hardware or driver issue that makes the right button "stuck", but it doesn't happen anywhere else.

This review is for a previous version of the add-on (0.4.6).