You make Firefox create a new profile, then move all old contents to the new 
one. This most probably removes a "lock file". When Firefox starts, it notes in 
the profile "this one is already in use", so a new Firefox process doesn't 
corrupt that profile by using it twice at the same time. You're working around 
that by creating a new profile, then moving the contents open, thus making it 
possible for Firefox to unintentionally destroy your data.
Just use the workarounds in this bug report: Run "killall firefox" in your 
terminal so it dies again.

For the purpose of this bug report: I haven't had this bug in ages.
Maybe the bug was in KDE/Qt (since that shows up in the backtrace) and
it has since been fixed. On the other hand, sometimes it seems to be
caused by other things, like pulseaudio and maybe flash: when a firefox
instance is still around, killall pulseaudio kills it too, iirc. Any
other known causes for this bug to appear? If not, I think the bug is
safe to close.

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[MASTER]Firefox is already running message
https://bugs.launchpad.net/bugs/308605
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