Fix Firefox if sometimes it loses focus when you open a new page or tab
It is frequent enough to become very annoying, when Firefox loses focus forcing you to click its window to keep using it. This may happen when you open a new page in the same or in a new tab.
This is not a Firefox but a Flash problem! Until Adobe fixes the bug, you can free your Firefox by following this simple solution (no need to uninstall Flash or install an older version).
– Go to \Windows\System32\Macromed\Flash\
– Open the file mms.cfg in your Notepad,
– Add this line: ProtectedMode=0
Save and close the file, restart Firefox, and enjoy!