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My firefox crashed and I re-installed it. Now it says one copy of firefox already running and the software does not open

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My firefox crashed and I re-installed it. Now when after re-installing I tried to open the application, it gives me a message that a copy of firefox is already running and you cannot open another copy of the software.

I checked and removed all firefox documents and re-installed but the same problem occurs.

My firefox crashed and I re-installed it. Now when after re-installing I tried to open the application, it gives me a message that a copy of firefox is already running and you cannot open another copy of the software. I checked and removed all firefox documents and re-installed but the same problem occurs.
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Additional System Details

Application

  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/603.3.8 (KHTML, like Gecko) Version/10.1.2 Safari/603.3.8

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FredMcD
  • Top 10 Contributor
4147 solutions 57876 answers

What's your computer system and Firefox version?

Reboot the computer. Is the problem still there?

What's your computer system and Firefox version? Reboot the computer. Is the problem still there?
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Question owner

Mac OS X Yosemite 10.10.5

Mac OS X Yosemite 10.10.5
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Question owner

rebooted. no help. have attached a screenshot of the error

rebooted. no help. have attached a screenshot of the error
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FredMcD
  • Top 10 Contributor
4147 solutions 57876 answers

From the time you booted up, describe what you did that lead up to the error message.

From the time you booted up, describe what you did that lead up to the error message.
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FredMcD
  • Top 10 Contributor
4147 solutions 57876 answers
[https://support.mozilla.org/en-US/kb/firefox-already-running-not-responding "Firefox is already running but is not responding" error message - How to fix it]
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McCoy
  • Top 10 Contributor
464 solutions 4230 answers
Hello dushyantchopra, Would you please take a look at this : https://www.basezap.com/cant-open-firefox-because-a-copy-of-firefox-is-already-open-mac/ And also : https://apple.stackexchange.com/questions/196771/cant-open-firefox-because-a-copy-of-firefox-is-already-open Does that help ?
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Question owner

I tried this, but could not find firefox running in the activity monitor.

I tried this, but could not find firefox running in the activity monitor.
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Question owner

I re-installed firefox and tried to open it. Got the same error message

I re-installed firefox and tried to open it. Got the same error message
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FredMcD
  • Top 10 Contributor
4147 solutions 57876 answers

Did you do a clean install? (Removing all program folders)

Did you do a clean install? (Removing all program folders)
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Question owner

Yup I removed everything

Yup I removed everything
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