[Bug 1234468]

[Bugzilla-g]

I suspect it *is* Mozilla, but I'm not sure. It'd be great to hear from
some devs here.

I did do some troubleshooting in the following threads that might be useful:
https://forum.kde.org/viewtopic.php?f=111&t=110202
https://forum.kde.org/viewtopic.php?f=111&t=117704

I was told "Firefox has quite a lot issues with X as they more or less
have their own toolkit instead of going with default ones." Indeed I
have only come across this problem with FF/TB and unclutter, and nothing
else.

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https://bugs.launchpad.net/bugs/1234468

Title:
  Keystrokes are hijacked by inactive window

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