Since upgrading to 21.0, if I have 2 windows open, too often the active window changes -- unasked. Why?

Hard to add details since I can't say exactly what action makes this happens. It seems like what happens is that I have clicked something in preparation to start typing -- in a forum post or a search bar or something -- and then find I'm not actually typing because the 2nd open window has suddenly become active. I'm hoping others have experienced this and will know what I'm talking about; up until now I've just gotten annoyed, switched windows, and plodded on. This did not happen before 21.0 was installed.

'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Once you get the pop-up, just select "'Start in Safe Mode"''
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''

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