Strange Issue with W10 and Firefox 50.0.2

A strange thing is happening on my two laptops. I have two separate Firefox windows open and use the snap feature to split the two on the screen. Then I decide to maximize one Firefox window while the 2nd sits behind the maximized window. Randomly the 2nd window just pops up on the screen in the same split position that I left it before in front of the maximized window. I focus back on the maximized window, and a few minutes later it pops up again. Sometimes this happens again if I click on the start menu. This is really annoying when I am trying to work on something in full screen mode. This doesn't happen if I minimize the 2nd window before maximizing the 1st, but I never had to do this in the past with W7. I tried disabling snap assist but can't seem to find any other troubleshooting from searching. This only seems to happen with Firefox thus far in Win10 and on both my Alienware laptops. Any ideas?

 

Is this just with the Browser Firefox or does it happen in Edge, IE or Chrome?

 

I only use Firefox but I tried it with Edge and a couple of other apps and could not replicate the issue. It appears to be just Firefox doing this. I posted the same question in Mozilla's forum.

Tried disabling Snap entirely but problem still occurs.

 

A quick update to this. I installed the 64 bit version of Firefox yesterday on both my laptops and the problem seems to have gone away. Been browsing all day yesterday and today and the weird issue has not come up again. Looks like the issue may be limited to 32 bit Firefox, even the latest 51.0.1 release. I didn't even know there was a 64 bit version .