I'm running OSX Mavericks 10.9.5, Firefox 39.7.0.2 What happens is that i'm using an automated script with Selenium for automatic-forms-filling. Everything is working fine, just like it does on LinuxMint, but the problem is that when i bring another window to first plan (of any program at all) the "minimized" window running the automatic forms gets "maximized" i.e. brought to first plan when a javascript popup appears, thus not enabling me to run that window on background. Is there a way to run Firefox on OSX in such a way that Windows don't get switched to first plan when PopUps appear? It doesn't seem to have this behavior on LinuxMint.