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6 July, 2011

Firefox won't launch? “A copy of Firefox is already open”

Somehow, Firefox won't let Laurent relaunch the browser. Each time he tried to relaunch the browser, this is the message:
cantopen_firefox_500x208.jpg
The thing was... there was zero Firefox open.

Of course, he did quit the Firefox (and I checked it). I even checked all the running processes (Activity Monitor).

Just about to re-start his iMac, I decided to search for some help first.
Mozilla provides a complicated answer which did not help.
OS X Daily's article hit the nail.

In short, if you receive that annoying dialogue, it means that Firefox created a locked file while running, and did not clean that locked file. Why on earth do they need to create a locked file? I don't know, but some geeks might be able to provide a very sounding excuse for that.

Anyhow, all you have to do is to delete the locked file .parentlock located under your Firefox Profile folder (~/Library/Application\ Support/Firefox/Profiles/(saltedletters).default).

Once inside the .default Profiles folder, simply type
rm -rf .parentlock
in Terminal.app.

Posted by Antony on 6 July 2011 11:36 AM |
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comments
That may all be very well for Firefox's odd thing, but I have trouble with Messenger telling me it has logged me off as I am logged on in another place?
What's this all about? I have certainly logged out from Thailand. It's very annoying!!
Posted by Rev.Dr.Wu Yi on 6 July 2011 1:02 PM.
It is quite likely someone uses your login in Thailand. You might have the auto-login saved in the computer, or someone knows your password.
Posted by Antony on 6 July 2011 2:15 PM.
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