Firefox 5 will not launch. Error message "Another instance of Firefox is running" is generated every time

After updating to Firefox 5, on Windows XP machine, Firefox will not launch at all. No matter what I try, I just get the same error message, than Firefox is already running. Even after double checking task Manager, and ensuring that this is not true, as soon as I click to launch it again, the same message pops up. Everything worked well until I updated to version 5.

Is there any firewall running on your computer that may be blocking internet access?
* http://kb.mozillazine.org/Error_loading_websites
* http://support.apple.com/kb/ht1810 Mac OS X v10.5, 10.6: About the Application Firewall

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Firefox does not start. error message comes up saying firefox open.

Fire fox cannot be started as error message comes up saying Fire Fox is open and should be closed. I have shut down and restart computer several time and it still shows Firefox is open and running.I even uninstalled Firefox and re installed it still same problem cannot get Firefox.I need to get access to my book marks. How can I start Firefox and get my book marks? Please help. Thanks

Hello Jignesh.
This issue has been reported before by other users, and it turns out it's the effect of malware. In other words, your system is infected. To scan for malware, install, update and run these programs ''in this order''. They are all free for personal use, but some have limited functionality in their "free mode", but the features you'll miss are not really needed to find and remove the problem you have. Remember that ''not all programs detect the same malware''!
Malwarebytes' Anti-Malware - [http://www.malwarebytes.org/mbam.php malwarebytes.org/mbam.php]
SuperAntispyware - [http://www.superantispyware.com/ superantispyware.com]
AdAware - [http://www.lavasoftusa.com/software/adaware/ lavasoftusa.com/software/adaware]
Spybot Search & Destroy - [http://www.safer-networking.org/en/index.html safer-networking.org/en/index.html]
Windows Defender - [http://www.microsoft.com/windows/products/winfamily/defender/default.mspx microsoft.com/windows/products/winfamily/defender/default.mspx]
Dr. Web Cureit - [http://www.freedrweb.com/cureit/ freedrweb.com/cureit]
If these don't find it or can't clear it, please tell me and I'll provide you with further assistance.

When I try and launch Firefox, I get this error message A copy of Firefox is already open. Only one copy of Firefox can be open at a time." and have tried all of the trouble shooting tips, can you help?

When I try and launch Firefox, I get this error message >A copy of Firefox is already open. Only one copy of Firefox can be open at a time." and have tried all of the trouble shooting tips, can you help? I thought if I were to completely uninstall and re install it might help, but I cannot seem to find instructions to do this....

See [[Firefox is already running but is not responding]], the image shown in that article is the Windows equivalent of the error message that you are receiving, but the information relates to the Mac.

Firefox will not launch after latest OS X security update

Just installed latest Apple software update on Snow Leopard. Now, Firefox will not launch. Checked system logs and get this:
11/21/10 10:24:20 PM com.apple.launchd.peruser.501[155] ([0x0-0x6d06d].org.mozilla.firefox[802]) Exited with exit code: 1
The following may or may not be related. Before installing the update, I had lots of these messages in my logs:
11/21/10 7:27:17 PM firefox-bin[39594] *** __NSAutoreleaseNoPool(): Object 0x1422680 of class __NSCFDate autoreleased with no pool in place - just leaking
11/21/10 7:27:17 PM [0x0-0x493493].org.mozilla.firefox 2010-11-21 19:27:17.323 firefox-bin[39594:903] *** __NSAutoreleaseNoPool(): Object 0x1422680 of class __NSCFDate autoreleased with no pool in place - just leaking

Sounds like you may have a check in the box for HTTP and/or HTTPS proxy servers, but you are not behind a proxy server. Safari and Software Update use the HTTP port, Mail doesn't, and Firefox ignores the Mac OS preferences and uses it's own proxy settings.
Go to System Preferences > Network > active connection > Proxies tab and if there are proxies checked, UNcheck them.
Hope this helps...

Firefox will not launch, but shows in task manager, after updating graphics drivers to AMD's 13.1.

Hi,
After updating to the AMD 13.1 drivers, on my 5770, Firefox will not launch; it does, however, show in the task manager. I should note that it will start in Windows safe mode; when I had it open in safe mode, I used that time to disable all plugins, add-ons, extensions, and created a new profile. This did not help. I also tried launching Firefox in to its safe mode, and had no luck with this either.
I experienced this problem once before, when trying to update to a previous version. I believe I was moving from 12.1 to 12.4, but I'm not 100% sure of that. Ultimately, my solution then was to retrograde back to my previous driver. The steps mentioned in the previous paragraph did not help at that time, not did a complete reinstall.
15 years of computer repair experience, and this has me baffled.
Thank you to anyone who might be able to help.
Possibly relevant specs.
Windows 7 Ultimate x64
AMD Phenom II x4
6BG Ram
AMD 5770 graphics, running Catalyst 13.1

By any chance, did you disable Firefox's use of hardware graphics acceleration? To avoid a round-trip through Windows Safe Mode, you could try adding these to your prefs.js file while Firefox is closed.
To quickly open the folder with the correct prefs.js file, you can use
Help > Troubleshooting Information > "Show Folder" button
Because Firefox may overwrite change to this file at shutdown, you should edit it after closing Firefox and allowing a few moments for Firefox to finish updates to the files.
These are the preferences I think are most relevant:
user_pref("gfx.content.azure.enabled", false);
user_pref("gfx.direct2d.disabled", true);
Does that make any difference?

Firefox will not launch

firefox will not launch after upgrading. Every time I try to launch I am advised to reboot to complete the upgrade.

I think you already known that latest firefox version 13.0.x don't work with xp sp1, needs sp2 and above.
Try [https://support.mozilla.org/en-US/kb/uninstall-firefox-from-your-computer Uninstall Firefox from your computer]
then Download the latest version(with your safari) from :
http://www.mozilla.org/en-US/firefox/all.html
and Install the version that you have downloaded (13.0.1).
Do not select to remove your personal data, your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks or other personal data.
see also for info : [https://support.mozilla.org/en-US/kb/install-firefox-windows Install Firefox on Windows]
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

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Mylenium

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Hey sergioo9,
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FaceTime, Game Center, Messages: Troubleshooting sign in issues - Apple Support
Thanks for using Apple Support Communities.
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It is very annoying when I am at a favourite web site and Firefox will not automatically redirect to another page. It is so continuous and I have to "Allow" through the whole time I am at my favourite web sites

# Question
It is very annoying when I am at a favourite web site and Firefox will not automatically redirect to another page. It is so continuous and I have to "Allow" through the whole time I am at my favourite web sites.
Here is one of those sites:
http://conservatives4palin.com/

You can make it automatically redirect by doing this:
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3. Click 'OK'
'''If this was the answer you were looking for, please click 'Solved' -- Thanks.'''

Question: i upgraded to Lion and now itune upgrade will not install (error message appears)

i upgraded to Lion and now itune upgrade will not install (error message appears)

iPhoto needs to be upgraded in order to work with Mavericks. You can do that via Software Update or the App Store.
The iWork apps are free with a new iOS device since 1 SEP 2013. They are free with a new Mac since 1 OCT 2013. They are also free with the upgrade to OS X Mavericks 10.9 if you had the previous version installed when you upgraded.
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Firefox will not launch in any mode. I cannot open Profile manager to change to another profile. No change with delete and reload of program.

I've been using Firefox for years. Had this happen once before but was able to open the profile manager and change to a new profile. At this point I can't even do that. Suggestions??

[[Basic Troubleshooting]] has a "clean reinstall" section at the end that does not require you to open Firefox.
In any case, you should first take a look at the [[Firefox will not start]] article, which I mentioned in my first post. If that doesn't help, also check out http://kb.mozillazine.org/Browser_will_not_start_up#Windows-specific_problems

I get a crash notice. Firefox will not launch at all -- it keeps giving crash notice. I also cannot generate a crash report. I have uninstalled and reinstalled -- same issue. It does not launch.

Firefox crashed this morning. It will not launch even after being uninstalled and reinstalled. All I can get is a crash box. It will not relaunch in any way
== This happened ==
Every time Firefox opened
== this morning -- it did not open ==
== User Agent ==
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This sounds the same as my issue. I was browsing in Firefox v6.0 last night and all of a sudden it closed with no notice or error message. When I tried to open FF I received the messaga; We're Sorry - Firefox had a problem and crashed. We'll try to restore your tabs and windows when it restarts." I does not restart. I have been using IE to browse for a solution and nothing works other than opening as administrator. Now this problem is only on one of my laptops and is fine on my desktop and other laptops so it appears to be something specific to my laptop which is running Window XP Home and Service Pack 3.
Some suggestions were to change the profile (did not work), end the firefox.exe process in task manager (not running in processes) and delete an xpicleanup.exe (not listed).
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file.

Firefox will not launch when I click the icon, it worked okay previously

A week ago firefox began taking a long time to launch sometimes requireing reclicking the icon.
Now it will not launch at all.
I get no error messages, nothing happens when I click the icon.
HELP

A possible cause is security software (firewall) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Firefox from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.
See:
*https://support.mozilla.org/kb/Server+not+found
*https://support.mozilla.org/kb/Firewalls
See also:
*http://kb.mozillazine.org/Browser_will_not_start_up

After updating firefox will not launch

Ever since version 8 became available whenever I update FF it will not launch. No error messages or anything, just no response at all from the button. I have cleared the cache and cookies, completely removed FF using the control panel - add remove programs, deleted the FF folder from C: program files and then emptied the trash. then downloaded a fresh copy of FF from www.mozilla.org. Again no response at all when attempting to launch. not even an error report. I am running Microsoft XP Pro 5.1.200 SP 3 Build 2600 on a Dell OptiPlex 745 processor x86 family 6 model 15 stepping 2 intel ~1794 mhz

What about the latest version of Firefox, Firefox 9? Does that work?
If it doesn't, the instructions here might be of help: [[Firefox will not start]]

Palm Pre crazy symptoms: "phone offline", will not charge battery, will not start, error message "an error has occured that cannot be resolved"

This is a long description of a series of problems with my new Palm Pre. You may wish to search the text to find your specific issue(s). There is no solution in my post. Look for possible answers in the responses to come.
I bought my Palm Pre 4 days ago and it arrived 2 days ago. Phone worked great. Last night I plugged in the phone and updated the OS. After completion, I selected "Done" and went to bed.
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In upper lefthand corner of the phone there is the message "phone offline". Although the phone has been charging all night it reads "26% battery". I called the general Sprint tech support number and we tried the following things:
1) Restart phone (press and hold power button, then select "turn off". after power down, press and hold power button to power on.)
2) Reset the phone (several different ways - call tech support so that you do this correctly)
The individual at Sprint then sent me to another tech support person, presumably 2nd tier.
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Sprint tech support person #2 also had me restart and reset the phone in a number of ways. In her words "we've tried every palm pre trick I know" and each time the phone was unresponsive. Often we received the error message "phone is offline". We did a full erase and after that the phone would no longer restart. At this point the error message came up saying "an error has occured that cannot be resolved" which referred me to www.palm.com for assistance. I think it's important to note here that this was not the typical error message (black screen with white letters) but rather the blue sky background with a semitransparent box over it with white text.
Sprint tech support person #2 then connected me with Palm support and the dance continued. Again we tried a whole bunch of resetting and restarting and erasing options. Palm support instructed me to go to: www.palm.com/rom to download WebOS Doctor, which I did. I downloaded the file. While that was happening he had me hold the "volume up" button and plug the phone into the charger. This caused a USB symbol to appear on the phone. When the file was complete I received an error message that the file couldn't run. Palm tech support person seemed surprised. I mentioned that I was on a Mac and he said he couldn't help me. He then transferred me to another Palm support person who works with Mac users.
Palms tech support person #2 then informed me that I should have selected the "mac" download option on www.palm.com/rom. I verbally walked her through the whole series of webpages, telling her that it says that you need Windows (version whatever) or Mac (version whatever) but that at no time was there an option to download a different WebOS Doctor for different operating systems. After some more discussion she told me she would have to have someone call me back tomorrow.
- Third Series of Issues: phone stuck on USB symbol -
So at the moment the phone is completely useless. Not fantastic. I booted up the mac in Windows 7 and downloaded WebOS Doc and received the same error. I also ran Windows Vista virtually and received the same error. Later this afternoon I'm heading into work to try the same thing on Windows XP.
In the meantime, I got onto this forum and located a thread that provided a direct link to the necessary file:
palm.cdnetworks.net/staging/rom/webosdoctorp100ewwsprint.jar
After downloading that file, which I realized could totally be a virus, I was able to get WebOS Doc working on my computer. It required that I recharge the phone completely before beginning and now it's on the screen that says "Don't disconnect your phone" and the file is at 3% complete. Only... it's been at 3% complete for almost 30 minutes.
I am hoping that Palm will follow up with me tomorrow, but I'm leaving at 7am on a business trip and would love to have the thing working. Any suggestions are welcome, even if you can just tell me how to get the think disconnected safely before my flight tomorrow. I don't fancy getting through security with my phone wired to my laptop.
Thanks.
Post relates to: Pre p100eww (Sprint)
This question was solved.
View Solution.

Hello and welcome to the forums;
Our phone support is open every day Monday through Sunday, although there are different hours of operation for the weekend. If after a webOS Doctor reset you are still experiencing the same problems, I would likely recommend replacement, either in a local store for your carrier or through our technical support department.
There may be additional technical support offered or suggested over the phone, this would need to be done first before a replacement could be issued.
Hope this helps,
TreoAide

Firefox 5 will not launch. Error message "Another instance of Firefox is running" is generated every time

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