Sometime in the past two weeks, Firefox started, maybe 2-3 times a week, switching the browser window I'm in. This always happens when I'm typing - when composing a message in gmail, but I think in other instances. I have made no material changes to my computer during that time. Computer is a laptop, with an external mouse. Thinking my clumsy thumbs were hitting the touchpad while typing, I disabled the touchpad when there's a mouse plugged in. But the switches still happen. It's not an alt+tab thing, which will display running windows and tasks as you hit that. I'll just be going like gangbusters, and all of a sudden my browser window is gone and the other FF window is the active one. My behavior and dexterity haven't changed. This doesn't happen with my other desktop computer running Windows 7. Just with this Windows 10 laptop, and just within the past couple weeks. I can't think of or find any key combinations that would trigger a swap of active window. Other ideas? Thanks.