I am unable to start Firefox. Getting message that it's already running. Can't find my profile using "%APPDATA%\Mozilla\Firefox\Profiles|". What do I need to do

I am unable to start Firefox. Getting message that it's already running. Can't find my profile using "%APPDATA%\Mozilla\Firefox\Profiles|". Rebooting my computer didn't help. Since I experienced that problem I also noticed that all my bookmarks which I had copied into the Windows Internet Explorer have also disappeared. I am using Firefox as my primary search engine and usually don't use Internet Explorer. I am running Windows 7 on my machine.

Try this add on [https://addons.mozilla.org/en-US/firefox/addon/open-profile-folder/ Open Profile Folder]

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When I try to start Firefox, I get a message that it is already running but not responding and I can't run another Firefox at the same time. I uninstalled and reinstalled. No change. Tried various other suggestions. Help!!

When I try to start Firefox, I get a message that it is already running, but not responding and that I should close it before trying to run another Firefox. But I cannot find a way to close Firefox program that is not running as far as I can see. I tried uninstalling and reinstalling Firefox, but that did not work. I've tried various other things, but no luck. I thought programs should stop when the computer is turned off, but that didn't work either.

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

Unable to open firefox - get message that " a copy is already open and only one copy can be open at a time. I have dragged the app to the waste basket and downloaded another firefox app. However same result". I have a IMAC , V.10.6.3.

Unable to open firefox - get message that " a copy is already open and only one copy can be open at a time. I have dragged the app to the waste basket and downloaded another firefox app. However same result". I have a IMAC , V.10.6.3.
I get above message when I click on the firefox icon.

This worked, I used the method described in this link http://forums.mozillazine.org/viewtopic.php?t=365156, and opened the Mozilla profile screen with the terminal on my mac, using the language given in the links. Then I duplicated my original profile to save the bookmarks, etc. Put them in a folder listed Duplicate profile with the date. With the open profile screen, I deleted my original profile, created new profile folder and then a new profile. Note that profile cannot be created in the system library, it must be created on the disc, because the library will not allow writing into it. After I created my new profile folder, I dragged all my old information into it, and it worked. Firefox closed and the error disappeared. You must be VERY careful to make sure Firefox is closed anytime you are doing anything with the profile folders. I think that is what caused my original problem.

Upgraded to Firefox 8 and rebooted but when trying to start FF get message that reboot is require to complete installation; same message if I try to re-install or uninstall FF. Writing this using Google Chrome.

Upgrade to FF 8 (from 3.6) appeared to go smoothly, as did reboot, on Acer desktop running Windows 7 Home Premium. But I get "reboot required to complete FF installation" every time I try to start FF. Tried to uninstall FF using Control Panel uninstall and also using the uninstall in my Mozilla folder--get same "reboot required" message. Tried to reinstall FF--same message. In short, FF totally inoperable--and I'm starting to like Google Chrome.

Please see:
http://kb.mozillazine.org/Software_Update (Software Update not working properly)
Delete the files in:
C:\Users\<user>\AppData\Local\Mozilla\Firefox\Mozilla Firefox\updates (%LOCALAPPDATA%\Mozilla\Firefox\Mozilla Firefox)
(The above is for a windows installation - a Mac installation stores its files in /Applications/Firefox.app 
To open one of these folders in OSX, Ctrl-click it and select Show Package Contents. )
Download a fresh copy of Firefox for installation.
Uninstall your current Firefox version before installing but don't remove your profile data when you uninstall Firefox (do not select to remove personal data) or you will lose your bookmarks and other data in the profile folder. Remove the program folder for Firefox as well.
Do a clean reinstall as an administrator. See:
http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
For information on your profile folder, see Managing profiles and:
http://kb.mozillazine.org/Profile_folder_-_Firefox
http://kb.mozillazine.org/Profile_backup
Please let us know how you fare.
edited to specify path difference on Windows

Fire fox will not open and give the message that program is already running when it is not and i have to restart my computer. i am running windows xp and this problem started after the last up date. i have tried uninstalling and reinstalling the program

is this a known issue?

If you close Firefox properly the problem will practically disappear.
To close Firefox properly:
:Closing Firefox ''(#close_firefox)'', avoid getting Firefox already running messages:  To properly shutdown Firefox when multiple windows or closing the
last window use File → Exit/Quit (or Firefox button → Exit).  Closing Firefox with the [X] in the upper right corner closes the window ("Ctrl+W") but that does not necessarily close Firefox if it has subtasks running.  If you want to close and reopen Firefox use the "Restart" within Add-ons if you made a change requiring a restart, or install "[https://addons.mozilla.org/en-US/firefox/addon/restartless-restart/ Restartless Restart]" ("Ctrl+Alt+R") which will allow you to take Firefox down and restart without having to check the Windows Task Manager to see if Firefox first actually ended. ([http://kb.mozillazine.org/Firefox_hangs Firefox hangs])
In checking the Windows Task Manager be sure to check the "Process" tab not the "Application"tab/

Trying to install flash player; keep getting message that only single instance application can rub, but this has been happening 2/3 days; help?

I've been attempting to install Flashplayer, but keep getting the message that only a single instance of the application can run. Have tried various things but not getting anywhere.
Can anyone assist? Thanks.

Does this error appear after you complete the download and start up the installer file? If so, you may need to restart Windows. Sometimes the Windows Installer accumulates a backlog of changes and stops working correctly until you restart your system and let it clear its queue.

When trying to open browser, keep getting message that it's already open, or to log of and restart PC

when finished browsing the web, i close Firefox and put my computer to low power, or sleep, hours later , turn it on , click on the Firefox Icon , and get a message that mozilla firefox is already running, and if there is a problem restart the PC.
this goes on almost every day for the last 6 to 7 months, and i keep it updated all the time. I was ready to give Mozilla Firefox up, but I don't like Microsoft Internet Explorer, so I put-up with the problem.
any help will be very appreciated,

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

Am getting message that scanner is not compatible with my macbook and to use twain software. Any suggestions?

Need help with downloading driver for scanner . Have HP M1005 MFP. Am getting message to use twain software. Any suggestions?

Your HP M1005 MFP all in one is too old and unsupported for 10.8.5
HP's site says that OS X 10.3 and 10.4 are supported. It does not, repeat, does NOT mention 10.5 much less newer.
Also there is no patch support for same on the last resort:
http://www.sane-project.org/sane-mfgs.html#Z-HEWLETT-PACKARD
Nothing on earth is as aggravating as twain drivers for scanners. Ive installed every make and model on PC and Mac, and theyre all hair-pulling-worthy.

When I log off of Firefox, do something else, and then want to get back on Firefox it says that it is already running and have to close the old Firefox out. How do I do it? Now, I'm restarting the computer. Is there an easier way? Thanks Steve

I x off Firefox and work on MS Pub or Word, perhaps my email. If, for some reason I want to go back on Firefox, a box comes up and says it's already running - to close it and restart Firefox. I can't find where to close it? If I could re-open it, that would be fine, but to close it - there are no tabs, icons etc. So, I simply restart the whole computer and begin again. That's a long way round the barn!
Steve

Check the task manager (ctrl + shift + esc) and look for firefox.exe in the processes tab. If it's running, close it.

Have noticed that after closing Firefox -- when I try to reopen it - get mesg that it is already running -- Am using vers. 6

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

Must be the "hang at exit" problem. 
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#Why Firefox may hang:
#*[http://support.mozilla.com/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably and Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.com/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.com/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''
Not related to your question, but...
You need to update some plug-ins:
*Plug-in check: https://www-trunk.stage.mozilla.com/en-US/plugincheck/
*Adobe PDF Plug-In For Firefox and Netscape: [https://support.mozilla.com/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Next Generation Java Plug-in for Mozilla browsers: [https://support.mozilla.com/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

Unable to update softward--get message that I do not have sufficient privileges for some of the items

unable to update; message appears "operation can't be completed because you do not have sufficient privileges for some of the items"
using Mac OS 10.4.11
== attempted to update firefox from 3.0.9 to 3.6.6 ==
== User Agent ==
Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10_4_11; en) AppleWebKit/533.16 (KHTML, like Gecko) Version/4.1 Safari/533.16

Try to repair the disk permissions:
* http://thexlab.com/faqs/repairprocess.html

I close out Firefox then when I try to reopen it, I get a message that it is still running. I've had so many bugs with Firefox that I'm removing it and going back to IE.

The problems I've had with Firefox are numerous. It keeps running in the background and won't reopen. I have to go to the task manager and close it manually. Now, it won't load my iGoogle homepage. I was loading fine, earlier but now won't. My other browsers work fine. There are just too many bugs here.

For more information see [[Basic Troubleshooting]], under
'''4. Restart Firefox in Safe Mode'''

When I close Firefox by clicking on X in the upper right corner of Vista, Firebox doesn't close and the next time I click on FireFox I get a message that FF is still running but not responding. I use alt,ctlr,delete to use Task Manager to close FF. Why?

The details are in the question. Don't know what else to add.

https://support.mozilla.com/en-US/kb/Firefox%20hangs (See '''hang-at-exit''')

When I try to activate Firefox, I get the message that it's already running. I have to log out or restart to be able to activate it. I have tried updating and reinstalling, but to no avail. Any suggestions?

I have updated the program several times and today uninstalled it and reinstalled it again. The second time I used it, i was told it was already running, though I had closed my internet page. Any suggestions will be appreciated.

Your above posted system details show outdated plugin(s) with known security and stability risks.
*Next Generation Java Plug-in 1.6.0_15 for Mozilla browsers
Update the [[Java]] plugin to the latest version.
*http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)

Get message saying one or more files can not be found when using plug in Perfect effects 8.5 in Lightroom 5

Cant open Perfect Effects in lightroom 5

Update: I have just installed version 8.1.1. and exported my library and the issue seems to be fixed. I don't believe that export libary had any impact so it mostlikely is version 8.1.1. who has fixed the isssue. I will keep an eye on it and get you posted on how it goes.
Thanks Cees
Message was edited by: Cees on an apple

I am unable to start Firefox. Getting message that it's already running. Can't find my profile using "%APPDATA%\Mozilla\Firefox\Profiles|". What do I need to do

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