When I try to open Firefox, I get a message that one is already open, though I'm not able to access it. How can I eliminate the invisible version?

I've been having problems with pdf and Firefox on my iMac. In the absence of being able to find an 'uninstall' function (and reinstall with a newer version), I deleted Firefox by dragging the application item to the trash and deleting. Then I downloaded a new Firefox version 5. But, when I try to open it, the above message comes up. This happens even if I shut down and restart. what do I need to do?

I have tried everything I could to fix this, but some things require actually being on Firefox, and since I cannot get on, I cannot click on the tabs to do it. I have even totally uninstalled firefox, and that has not fixed this. I still get the same message that firefox is running and I need to close it or restart (which I have also tried dozens of times). I have removed things like Java, and that has not helped either. If I cannot even get on line in firefox, how can I fix this. I am not crazy about using internet explorer, but right now, it is my only option. I even tried to start in safe mode, and the same message box pops up!

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How are you opening the Profile Manager?
*http://kb.mozillazine.org/Profile_Manager
Sounds that Firefox is still or already running.<br />
See:
*http://kb.mozillazine.org/Kill_application

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See:
* http://kb.mozillazine.org/Recovering_a_missing_profile
* http://kb.mozillazine.org/Profile_in_use
* https://support.mozilla.com/kb/Firefox+is+already+running+but+is+not+responding
If it happens after you've closed Firefox and want to restart the see these:
See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.com/kb/Firefox+hangs

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See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]
See also:
* http://kb.mozillazine.org/Firefox_crashes

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== This happened ==
Every time Firefox opened
== july 7th about 6:00pm

Steps to resolve this issue:
1. Open Firefox
2. Go to '''Tools>Options>Advanced>Network>Settings'''
3. Check '''No Proxy'''

Every time I try to open Firefox I get a popup saying it is already open, and to close it or restart; but it is NOT open, and restarting doesn't help.

<blockquote>Locking duplicate thread.<br>
Please continue here: [[/questions/880054]]</blockquote>
Question
Every time I try to open Firefox I get a popup saying it is already open, and to close it or restart; but it is NOT open, and restarting doesn't he

Duplicate Thread LOCK please
* Continue here - https://support.mozilla.com/en-US/questions/880054

When I open firefox I get a message that "A copy of Firefox is already open. Only one copy of Firefox can be open at a time"

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See http://kb.mozillazine.org/Profile_in_use

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What version Mac OS X?
What version Excel?

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1. See Lion/Mountain Lion's Storage Display.
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3. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
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When I try to open Firefox, I get a message that one is already open, though I'm not able to access it. How can I eliminate the invisible version?

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