Request reply opens in wrong window

Request reply opens in wrong window

I'm using Firefox Quantum 59.0.2, running in full screen mode on the right window on my desktop. When I click the Reply button on a request the "Mail to Requester" window opens in the center of the left window. If I use IE or Chrome the window opens in the correct (right) window, but I prefer using Firefox. I just checked and the "About" and "License" links in the help menu do the same thing.

We're running ServiceDesk Plus, version 9.4 Build 9400, and I'm running Windows 10 1607 on my desktop.

Anybody have any ideas on why this is happening and how I can make it stop? It's starting to get on my nerves.

Thanks.

Tom

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