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This add-on worked fine up until firefox 47. Now it will only detect one monitor. No graphical image for second monitor in menu's - no longer moves window to second monitor when you press the tool-bar button.

UPDATE: My OS is Windows 7 64bit and I am running version 7.2 of your extension. No relative information in the browsers console.

If I manually move the browser to the second monitor, the graphical interface on the tab no longer works. As soon as I move the browser back to my 'main' screen the interface works but I can still only see that monitor.

I changed my main monitor and the problem is reversed.

Questa recensione riguarda una versione precedente (7.2) del componente aggiuntivo. 

It would be nice if you would at least report your OS, since I can't reproduce this on Windows 7 or 10 (or I would have repaired it). You should make sure that you run the latest version of this extension and you might want to check the browser console (Ctrl-Shift-J) to see whether anything related to Window Master is being logged.