I have three Monitors. There’s no Option to let the Software know, that it should start on the second monitor… always starts on the first. 
I don’t think it’s a problem with the FF, but check the settings on you’re graphic card or the options of you’re operating system.
Always checked… second Monitor is configured as primary Monitor… but Game thinks that first Monitor is right… I have three Monitors and I don’t want to change the cable Management… because every other app works fine with it.
Have you manually moved it to the middle window? I have two monitors and it also started on the first, but I play games on the second.
After deselecting full screen I moved it to the second monitor, then set it back to full screen. It opens on the second screen now.
An option to select which screen it should be on would be nice, instead of having to go through the process above.
The “full screen” - Tipp works fine. Thanks. I looked for it, but din’t find it first… now I found it. 
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Try this. I only have one monitor, but I use two desktops. In Windows 10, at the bottom of the screen just left of any icons is a film strip looking icon. That allows you to add or switch to multiple virtual desktops. Each has all the icons (files and shortcuts) you would have on your desktop but running applications can only exist in one of them and you can move them while they are running as well with drag and drop. Once you have multiple virtual desktops running, you can use Ctrl.L+Win+(Arrow.L or Arrow.R) to cycle between them. I keep games on my 2nd (right side) virtual desktop so that if they bug out when I alt-tab, or if they freeze and won’t let me do so, then I have another way out.
I don’t know how this will behave with multiple monitors and it may not work for you unless you can somehow tell windows to keep a virtual desktop on the specified monitor only. You might also try changing your multiple displays option. Last time I had multiple displays, I remember there being one to stretch the desktop across, one to clone it, and one to do something different, but I don’t remember that third option.
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