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When I try to open Firefox 3.6 (Mac) by clicking on the icon, I get this message: "Close Firefox: A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I've removed older versions and restarted, but still get this message. Wh

I've just downloaded Firefox 3.6 (Mac). When I attempt to open, this message pops up: "Close Firefox: A copy of Firefox is already open. Only one copy of Firefox can be open at a time." I've removed older versions and restarted, but still get th

"a copy of firefox is already open." alert, however firefox is not open on my macbook. I have to take midterms, I need help with this ASAP!

I keep getting the "a copy of firefox is already open" alert and it's not opened. I have researched it and nothing is working. I have a macbook pro version 10.9Try restarting the computer. If the problem continues, post back with more informatio

"A copy of firefox is already open. Only one copy of firefox can be open at a time." What do I do?

I was installing Firefox 4.0.1 and something went wrong. Now every time I try to open Firefox, an error message that says "A copy of firefox is already open. Only one copy of Firefox can be open at a time." I've looked it up and every forum says

Can't open Firefox. When I try to open, a window pops saying "Close Firefox" and "A copy of Firefox is already open. Only one copy of Firefox can be open at a time.", and doesn't allow the application to open.

Came home to find computer restarted, which I assume is an automatic Firefox update. When I try to open Firefox, window pops up saying "Close Firefox" and, "A copy of Firefox is already open. Only one copy of Firefox can be open at a time.&

A Copy of Firefox is already open. Only one copy of Firefox can be open at a time

I have shut down my mac for half a dozen times in response to the warning -- A Copy of Firefox is already open. Only one copy of Firefox can be open at a time -- that comes up each time I attempt to launch the browser. I have tried out the solutions

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"

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" Nothing I have tried fixes the problemSee http://kb.mozillazine.org/Profile_in_useRead other 2 answers

I have tried everything I've run across for "A copy of Firefox is already open. Only one copy of Firefox can be open at a time."

I had to fully erase all Mozilla/Firefox files from my Mac (OS X), including my profile (I backed up the bookmarks first). I had to as there were issues pointing to erasing it completely as a last step. I have a two-fold issue. One is that I kept del

I've closed Firefox. When I go to reopen it, it says "Close Firefox: A copy of Firefox is already open. Only one copy of Firefox can be open at a time". I've then shut off my laptop; restart it and this same Firefox issue continues.

I can't seem to reopen Firefox. I HAVE, in fact, closed Firefox. I've even "force quit" it. When I shut down my computer and restarted it, I got Firefox back, but then when I went off and tried to come back on, the problem reoccurred. When I try

A copy of Firefox is already open. Only one copy of Firefox can be open at a time -- HOW DO I SOLVE THIS?

I have read the other threads and tried what they suggested and am still unable to solve this. I am using OSX 10.7.5 I have tried uninstalling and reinstalling firefox. This did not work. Any suggestions?Create a new profile as a test to check if you

Every time I try to start Firefox I get"A copy of FF is already open. Only one can be opened at a time" How o I get FF to work?

I can't get Firefox to start up. I've downloaded a new copy several times and keep getting the error message, "A copy of Firefox is already open. Only one copy of Firefox can be open at a time". I do not have Firefox running anywhere.See [[Firef

I am told that Firefox is already open and I should turn it off before continuing to update.

When I open Firefox, I am prompted to update and I say yes. Then it starts to install the update, but a window comes up and tells me that Firefox is already open, when it is not. This also happens when it restarts when I have installed an add-on.Do a

None of my Firefox icons will open Firefox today. And when I try to reinstall it, the message says Firefox is already open. But I don't see it.

Every morning I click on the Firefox icon and it opens. Today it will not. When I try to reinstall it, a message appears that Firefox is already open. But I cannot see it. Of course I can use Chrome or Internet Explorer (as I'm doing), but I like Fir

I am told that copy of Fierfox is already open.

I had Firefox before but uninstalled it. I decided to use it again. I installed it again but when I try to open it I am told that a copy is already open.This worked, I used the method described in this link http://forums.mozillazine.org/viewtopic.php

Icecat opens a Firefox window if Firefox is already open (&vice-versa)

I have both Firefox (firefox 13.0.1-1) and Icecat (icecat 12.0-1, from AUR) installed. If a Firefox window is open and I launch Icecat, an additional Firefox window appears. If Icecat is already open and I launch Firefox, an additional Icecat window

Firefox will not open - it says it has a copy open already - and it does not. This happened after I tried to update to new firefox.

I attempted to upload the new version of Firefox. When I did this - I could not open Firefox at all - a box pops up telling me to '''Close Firefox - a copy of firefox is already open - Only one copy of Firefox can be open at a time.'' I tried to remo

A botched install on a Mac (to do with importing a profile) means that Firefox won't open on the grounds that the application is 'already open'. Tried removing everything I can find to do with Firefox and re-installed but no success. Any suggestions?

Little more can be added to the above. The warning screen says, 'A copy of Firefox is already open. Only one copy of Firefox can be open at a time.' I have gone though all the libraries and preferences I can find and removed everything to do with Fir

I keep getting an error when clicking a link in email if firefox is not already open

If firefox in not open when I click a link in an email I get an error message. If firefox is already open it opens a new tab and works okay. After getting the error message it still opens firefox and goes to the link.The actual error was "There was a

I upgraded to Firefox 6 and now when I try to open it, a window says there's already a copy of Firefox open and there can only be one at a time but there is no other copy!

I was trying to update my Firefox profile from my old computer and it didn't work and as I was in the middle of that process I was prompted to upgrade to Firefox 6 which I did. But now when I try to open Firefox, it won't let me because it says there

Can't open Firefox : I get a window saying another copy of firefox is open . MAC OS10.6.4 , which is not the case . MAC OS 10.

I F I WANT TO OPEN FIREFOX A WINDOW POPS TELLING ME THERE IS ANOTHER COPY OF FIREFOX ALREADY OPEN AND I CAN'T GET TWO COPIES OPEN AT THE SAME TIME . I DELETED FIREFOX AND DOWNLOADED AGAIN , TO NO AVAIL. THE MESSAGE POPS OUT EVERY TIME I WANT TO OPEN

After updating Firefox, cannot open at all, system tells me Firefox is already running, but it isn't. I can't even remove it from system???

After updating to Firefox 6, I cannot open Firefox at all. Nothing happens when I try. I went to Control Panel and tried to remove Firefox, but my system tells me that Firefox is already running, please close to continue. I do not have another copy r