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Thu, Jan 26, 2017 10:56 pm

You can't open the application "Firefox.app" because it is not responding

I killed Firefox on my MacBook Pro laptop running OS X Yosemite (10.10.5) by clicking on the Apple icon at the upper, left-hand corner of the screen then selecting Force Quit and then selecting Firefox and clicking on the Force Click button. But when I tried to reopen Firefox, I saw the message 'You can't open the application "Firefox.app" because it is not responding.'

I clicked on OK and used Force Quit Applications again. I saw Firefox in the list and again forced it to quit. I then clicked on the Firefox icon in the Dock at the bottom of the screen again, but Firefox didn't appear to open. I double-clicked on it again, but it still didn't appear to open, though it appeared in the Force Quit Applications list again with "not responding" appearing next to its entry in the list of open apps. I tried clicking on the Firefox icon in the Dock a third time and this time saw the 'You can't open the application "Firefox.app" because it is not responding' message again, though reopening Force Quit Applications again did not show "not responding" next to the Firefox entry in its list. Nor was any other application listed as being unresponsive. I tried the Force Quit step again. Firefox remained in the list until I closed and reopened Force Quit Applications. Though Firefox wasn't in the Force Quit Applications list, I did see a process associated with Firefox when I used the ps command to view processes running on the system.

$ ps -ef | grep -i Firefox | grep -v grep
723184451  6861     1   0  8:46AM ??         0:00.03 /Applications/Firefox.app/Conte
nts/MacOS/plugin-container.app/Contents/MacOS/plugin-container /Library/Internet Plu
g-Ins/JavaAppletPlugin.plugin -greomni /Applications/Firefox.app/Contents/Resources/
omni.ja -appomni /Applications/Firefox.app/Contents/Resources/browser/omni.ja -appdi
r /Applications/Firefox.app/Contents/Resources/browser 1635 gecko-crash-server-pipe.
1635 org.mozilla.machname.776527788 plugin
$

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