Rated 5 out of 5 stars

Essential addon when having more than one monitor. In the last version the WM blue icon vanished (the button is blank) but it still works.
Edited: Thanks for the reply! After some tests I've found out that it only happens when I have the "Classic Toolbar Buttons" addon enabled, so I think that's the cause.

This review is for a previous version of the add-on (6.6.1-signed). 

Thank you for the positive review.

Perhaps you could let me know whether the icon is invisible no matter where the button is placed (tab bar, navigator bar, panel), what your OS and Firefox version are and whether you have any (complete) themes installed. This information may help me to find the cause. I may need to add some CSS rules for certain themes, given that the icon is pure CSS.

Edit: Classic Toolbar Buttons did not seem to have any negative effect on my system (Firefox 38 on Windows 7). Are you able to identify precisely what option causes this?

A very good add-on, and it recognizes multiple monitor very well.(Feature request) Rated 5 out of 5 stars

It recognizes when there's three monitors, two monitors, one.

It would be great if a keyboard shortcut could move the window to the desired screen or at least the home screen, for when the window is on a monitor that's not turned on.

How much can I donate for that to happen?

This review is for a previous version of the add-on (6.6.1-signed). 

This is the add-on I am looking For Rated 5 out of 5 stars

This add-on make your job in dual monitor, become much more easier and convenient.

This review is for a previous version of the add-on (6.6.1-signed).