I get an error message when I double click on Firefox... It says an application is already running and I need to restart my computer

I get an error message when I try to re-launch Firefox. I believe I have closed it out. When I try to launch the application it gives me an error message saying it is already running. it tells me I need to restart the computer

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
# Shockwave Flash 10.1 r53
# Java Plug-in 1.5.0_06 for Netscape Navigator (DLL Helper)
Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/
Update the [[Java]] plugin to the latest version.
*http://java.sun.com/javase/downloads/index.jsp (Java Platform: Download JRE)

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See my answer to your previous duplicate question. What happened when you tried my answers?
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I recently upgraded to Mac OS X. I haven't tried to access anything in iWorks 09 since the upgrade, until now. I get an error message when trying to open any of the iWorks 09 applications. What's the fix for this?

Follow Sonicray's advice and when you post try to give as much info about your Mac, your OS, etc... Fill out your Profile info.

I've upgraded my pc and now Im getting an error message when Im trying to sync my ipod saying I have two itunes libraries. The library thats there is only showing some songs and it's not uploading songs Ive just bought.

I've upgraded my pc and now Im getting an error message when Im trying to sync my ipod saying I have two itunes libraries. The library thats there is only showing some songs and it's not uploading songs Ive just bought.

You seem to have tried everything, and you say it's syncing fine on your Dad's iMac, so I assume, you have also done a Disk Diagnostic from an earlier post by tt2 and conclude that your iPod Hardisk is good.
You don't have to use it as a heavy paperweight, the problem is only using your Windows 7 machine for syncing.
In your troubleshooting steps, did you try to use another High-Speed USB 2.0 port, USB controller resource are very scarce, so if you use other USB devices, while syncing your iPod, it may just freeze.
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Have a nice day!

Previously used overdrive media console to download audio books now i get an error message when trying to sync to iphone 4 after upgrading to 10.5 itunes and 5.0 on iphone unable to download audiobook states cannot play on iphone and does not convert

previously used overdrive media console to download audio books now i get an error message when trying to sync to iphone 4 after upgrading to 10.5 itunes and 5.0 on iphone unable to download audiobook states cannot play on iphone and does not convert

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I keep getting this error message when I (right-click) on a photo file on my desktop to burn to a CD. I don't understand this code...does anyone? Thanks Ariel**:The disc can't be burned because an unexpected error occurred (error code 0x80020000).

I keep getting this error message when I (right-click) on a photo file on my desktop to burn to a CD. I don't understand this code...does anyone? Thanks Ariel**: The disc can’t be burned because an unexpected error occurred (error code 0x80020000).

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Piggywiggle

I can't upgrade to Yosemite, keep getting an error message when I try to download from the app store. Have check reqs and have them all.

When trying to download from the app store I keep getting an error message saying "this version of OSX 10.10 cannot be installed on this computer"; however, when checking the requirements I have them all.
Specs
Macbook Pro 15 inch
OS X 10.7.5
4GB of memory
>120GB of storage available

MacBook Pro (Mid/Late 2007 or newer) is required. You've not indicated which one you have. If yours is one of these, then http://www.apple.com/support/mac/app-store/contact/
27" i7 iMac (Mid 2011) refurb, OS X Yo (10.10), Mavs, ML & SL, G4 450 MP w/10.5 & 9.2.2

When I try to sign in, I get a message saying its already running, and I have to restart my computer each time.

I'm not sure how much more info I can give...When I go to sign on after having been on and shutting down, I get a message indicating an application of Firefox is already running and need to shut it down or restart my computer. As Firefox is not running, I have to restart my computer each time to get back on.

Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles.<br /><br />
NOTE: Establish a habit of exiting/closing Firefox with Firefox button > Exit or File > Exit to allow an orderly shutdown of Firefox and closing of all of the files that Firefox has open.
#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]
#*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
#Why Firefox may hang:
#*[http://support.mozilla.org/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.org/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 an Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.org/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.org/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.org/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''
Not related to your question, but...
You may need to update some plug-ins. Check your plug-ins and update as necessary:
*Plug-in check --> http://www.mozilla.org/en-US/plugincheck/
*Adobe Shockwave for Director Netscape plug-in: [https://support.mozilla.org/en-US/kb/Using%20the%20Shockwave%20plugin%20with%20Firefox#w_installing-shockwave Installing ('''''or Updating''''') the Shockwave plugin with Firefox]
*'''''Adobe PDF Plug-In For Firefox and Netscape''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Adobe%20Reader%20plugin%20with%20Firefox#w_installing-and-updating-adobe-reader Installing/Updating Adobe Reader in Firefox]
*Shockwave Flash (Adobe Flash or Flash): [https://support.mozilla.org/en-US/kb/Managing%20the%20Flash%20plugin#w_updating-flash Updating Flash in Firefox]
*'''''Next Generation Java Plug-in for Mozilla browsers''''': [https://support.mozilla.org/en-US/kb/Using%20the%20Java%20plugin%20with%20Firefox#w_installing-or-updating-java Installing or Updating Java in Firefox]

I get an error message when I try to open Firefox, telling me I cannot have multiple copies open.

I'm using a G5 Power Mac. I have several internal hard drives. I also have two copies of Firefox. I have started up using a different drive and now when I try to open Firefox, I get the message that I cannot have multiple copies of the program open at the same time, but there not...

See: http://support.mozilla.com/en-US/questions/796303
The user-agent detection was incorrectly identifying FF4 as a mobile browser, in turn redirecting to a mobile version. Install the following addon to workaround this problem until it's fixed: https://addons.mozilla.org/en-us/firefox/addon/xhtml-mobile-profile/
Barb

I get an error message when i try to start firefox

This is the error message
Error: Platform version ' ' is not compatible with
minVersion >= 1.9.2.8
maxVersion

To fix this issue, simply update Firefox if you don't have latest version and update java and adobe flash player or downlaod them if you don't have them.

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Is there a way around this?

She has to be using some version of the camera connection kit doesn't she? Only way to get a card reader plugged into an iPad.
if the cards are SD cards, then plugging them directly iinto the camera connection kit is the best way. If they're not SD cards, then you can use the USB attachment to plug your camera directly into the iPad.
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I tried downloaded the browser again from IE, but that hasn't helped the problem.

[[Firefox is already running but is not responding]] has steps that you can try. It sounds like you may have something that is hanging your browser on exit (probably an extension or a locked profile) and the steps on that page should help clear it up.

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i need any help possible please

Hi sheryl525,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots.
Apple Computers: Troubleshooting the slot-loading SuperDrive
http://support.apple.com/kb/HT2801#
Cheers,
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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.

I get an error message when I double click on Firefox... It says an application is already running and I need to restart my computer

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