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This question already has an answer here:

I have entered a weird state

Firefox was open. The icon appears in the cmd+tab task menu.

In the dock it shows as "not responding". Force Quit does nothing though.

enter image description here

Ok... but then it doesn't show in Activity Monitor either. I have searched for "Firefox", "fox", "ff", "mozilla" and skimmed through by eye.

I have also tried grepping the output of ps aux and top in terminal but I can't find it.

I wondered if maybe it wasn't really open and just the dock icon/task switcher were confused, but when I double-click Firefox from the Applications folder:

enter image description here

I have tried relaunching Finder but it doesn't fix anything.

I assume a reboot will fix it, can anyone suggest another avenue?

marked as duplicate by klanomath, IconDaemon, grg osx Nov 5 '15 at 21:13

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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This is what I answered in a similar question. It did the trick for me.

I had the same problem with NetBeans and this is what worked for me:

sudo killall launchservicesd
sudo killall Dock

I hope this helps.

I based my answer in this post: Can't kill Preview app and in previous knowledge.

Check my answer here: App crashes, dock icon remains, can't reboot, yet no process in ps aux to kill.

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    Whilst this is a useful answer and quoting the content is much preferable to posting a link by itself, it's even more useful if you rather flag the question as a duplicate and provide the link to the duplicate to link the questions. – grg Nov 5 '15 at 21:14
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    I'll take that into consideration... – loco.loop Nov 5 '15 at 22:16
  • for me, as a SE user, I find the duplicate flagging significantly more obscure since the link is ABOVE the question - an answer in the answer section is where I look for information. (and often the "duplicates" are less useful or less directly applicable, often requiring a lot more digging through answers.) my 2 cents - I upvoted. :) – keen Nov 29 '16 at 4:28
  • Thanks so much, this was happening to me with Synergy app, and it happens frequently. I've now turned this into a bash script. – Justin Fortier Sep 1 '17 at 14:59

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