Firefox won't open even when running.

I have version 34.0.5 updated 12.19.2014.
Click on it several times. Sometimes open after many hours of waiting. Run Norton utilities weekly to clean computer. Read your articles. Solution requires going on Internet. How can I do that when Firefox doesn't open? I'm sending this question on my smartphone. Can I fix the problem on desktop computer from my smartphone?

Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from [https://www.mozilla.org mozilla.org] (or choose the download for your operating system and language from [https://www.mozilla.org/firefox/all/ this page]) and save the setup file to your computer.
#After the download finishes, close all Firefox windows (or open the Firefox menu [[Image:New Fx Menu]] and click the close button [[Image:Close 29]]).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
More information about reinstalling Firefox can be found [[Troubleshoot and diagnose Firefox problems#w_5-reinstall-firefox|here]].
WARNING: Do not use a third party uninstaller as part of this process. Doing so could permanently delete your [[Profiles|Firefox profile]] data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be easily recovered unless they have been backed up to an external device! See [[Back up and restore information in Firefox profiles]]. 
Please report back to say if this helped you!
Thank you.

Similar Messages

Firefox won't open. When i try to uninstall I get message that Firefox app must be closed, but it's not open.

Firefox suddenly quit opening. I uninstalled and then reinstalled it. It still wouldn't open. I tried to uninstall again and now I get a message that Firefox must be closed to prodceed with uninstall. I have even tried restarting the computer to make sure that Firefox is not running. I like Firefox and i want it back.

Thanks for this mha007 - I can now open FF with a new profile. Can I copy my settings from the old profile or will this bring over the same problem, maybe a corrupt file. If it would bring the same problem, is there any way I can check which file is corrupt, apart from taking them over one by one?

My computer tells me that Firefox is still open even when I can not see it. It will not allow me to open it to use.

I received an error message about a "spooler" and Firefox crashed. Ever since then I can not open Firefox but when I close down my computer it says Firefox is open. I have no access to Firefox

There are a few possible causes for that error, for details see [[Firefox is already running but is not responding]].

Firefox won't open up when i click on the icon.

when I click on the firefox icon, the little blue thing spins for a couple of seconds and then stops and nothing else happens.

Mozilla Crash Reporter
If you get the "Mozilla Crash Reporter" window when you start Firefox, see Firefox crashes - Troubleshoot, prevent and get help fixing crashes for solutions.
Firefox is already running but is not responding
See "Firefox is already running but is not responding" error message - How to fix it for solutions.
Your Firefox profile cannot be loaded. It may be missing or inaccessible
See How to run Firefox when your profile is missing or inaccessible for solutions.
XULRunner - Error
If you see the message, "XULRunner - Error: Platform version <x.x.x.x> is not compatible with minVersion <x.x.x.x>"" ("<x.x.x.x>" depends on version number), after a software update, use another browser to download the Firefox installer from mozilla.org/firefox, save it to the desktop or other location, delete the Firefox installation directory and then reinstall Firefox.
If Firefox still does not start, see the Firefox will not start after updating section below.
Error opening file for writing…
If you receive the above error when launching Firefox on a Windows system, you may be required by Firefox to log in as an administrator. You can either reboot the computer or, if you have an administrator account, you can execute the program as an administrator.
Find the firefox.exe program file in the Firefox application folder on your system.
Right-click the icon.
Select Run As Administrator…. Select The following user:. From the User name drop-down, select Administrator or another user that has administrator privileges. Enter the password required to log in to this account. Click OK.
The Firefox application is started using the administrator Windows account. The user that was used to log in to Windows at startup is still the active one.
Other error messages
If you get another error message (e.g. "XML Parsing Error: undefined entity Location", "Secure Connection Failed … uses an invalid security certificate"), see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.

IPhoto won't open even after running library upgrader

I upgraded to Yosemite.
When I received the prompt " To open your library with this version of iPhoto, it first needs to be prepared.", I did that (several times) but I continue to receive the prompt.
I deleted my iPhoto preference file - com.apple.iphoto.plist - and tried again, no luck.
I deleted iPhoto and installed the application anew, no luck.
If I MOVE my iPhoto library out of my Pictures folder, I could create a NEW iPhoto library - but I don't want to do that.
Help?

Did you go to your Applications/Utilities folder and find the upgrader there? Then double click on it to run it?
If I MOVE my iPhoto library out of my Pictures folder, I could create a NEW iPhoto library - but I don't want to do that.
No need to move anything: Hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Create Library'

Help new itunes upgrade won't open even when ipod is plugged in

Ok so evey time I click on the itunes icon in my start menu or plug in my ipod my computer makes that thinking noise they usually make when opening something and then nothing happens. I've also tried going into the itunes folder and clicking on files there and putting a cd in at which point no announcement comes up anymore asking me what I want the computer to do with it.
I don't know what to do and it's really frustrating! Please if anyone can help that would be hugely appreciated.

b noir wrote:
+I upgraded and now iTunes does not appear to open at all. The problem is error message free, like the original poster the outcome is the same if I use the icons on my desktop/start menu or click on the exe in the program folder. When I view the task manager it does not appear on the applications tab but Itunes.exe is a process on the process tab which can not be terminated (again with no error messages).+
That "itunes.exe process that will not die" is a familiar symptom ... What make and model of firewall are you running? Is it *Norton Internet Security 2005* by any chance?
I also just upgraded, itunes does not run, itunes.exe process comes up. I can end it though. Quicktime works, I also tried the 7.2 downgrade for quicktime also. I just uninstalled mcaffee, and also tried the msconfig troubleshooting, still no dice. I want the new ipod touch update, but I cant get it.

After downloading new version of firefox, i didn't like it and attempted to restore my system to a previous time and version of firefox. Now firefox won't open, even the old version isn't there anymore.

I want to get firefox back, keeping all of the bookmarks.

Download a fresh Firefox copy and save the file to the desktop.
* Firefox 8.0.x: http://www.mozilla.com/en-US/firefox/all.html
Uninstall your current Firefox version.
*Do not remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup

Ive re-installed Itunes but the file won't open even when prompted as administrator any ideas?

im at ends witt now it hasnt been working for about 3 months now and im stressing anyone help?

In the course of your troubleshooting to date, have you worked through the following document?
iTunes for Windows Vista or Windows 7: Troubleshooting unexpected quits, freezes, or launch issues

After cleaning out a trojan, Firefox won't open

Had a trojan. Got it deleted. Now, only for the user originally infected, Firefox won't open. When clicked, window opens asking which program I want to use to open firefox.exe. Huh? Opens & works fine for other users. How do I fix this? Can I recover this user's bookmarks?

See:
*http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox
*https://support.mozilla.com/kb/Recovering+important+data+from+an+old+profile
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
*http://kb.mozillazine.org/Browser_will_not_start_up

Firefox won't open following update. Can't open Profile Mgr, even when using entire directory path in cmd line

I'm running Firefox on a Windows 7 machine. Firefox won't open following the latest update. I've read the help articles and it seems like I need to create a new profile because my settings have likely been corrupted. I'm unable to open Profile Mgr, even when using entire directory path in cmd line. I've tried the following commands in the command line:
firefox -p
"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -p
Nothing happens with either command.
I'm also running Norton Internet Security. I read a help article Re Virtual Browsing features possibly causing a problem. The article said to check the virtualization setting in the internet security software and to clear the virtual cache. I went thru all of the settings menus in Norton Internet Security version 21.6.0.32 and I didn't see anything that looked like 'virtualization" settings, so I assumed that this doesn't apply to me.
If you have any ideas, I'd sure appreaciate your expertise!!

''arcandl [[#question-1038482|said]]''
<blockquote>
I'm running Firefox on a Windows 7 machine. Firefox won't open following the latest update. I've read the help articles and it seems like I need to create a new profile because my settings have likely been corrupted. I'm unable to open Profile Mgr, even when using entire directory path in cmd line. I've tried the following commands in the command line:
firefox -p
"C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -p
Nothing happens with either command.
I'm also running Norton Internet Security. I read a help article Re Virtual Browsing features possibly causing a problem. The article said to check the virtualization setting in the internet security software and to clear the virtual cache. I went thru all of the settings menus in Norton Internet Security version 21.6.0.32 and I didn't see anything that looked like 'virtualization" settings, so I assumed that this doesn't apply to me.
If you have any ideas, I'd sure appreaciate your expertise!!
</blockquote>
''philipp [[#answer-670108|said]]''
<blockquote>
hello arcandl, when firefox isn't launching after you double-click on the shortcut this is sometimes also a sign of malware being active on a system.
you might want to try running a scan with some different other security tools like the [http://www.malwarebytes.org/products/malwarebytes_free free version of malwarebytes] and [http://www.bleepingcomputer.com/download/adwcleaner/ adwcleaner] which are specialised in removing adware and browser hijackers.
[[Troubleshoot Firefox issues caused by malware]]
</blockquote>
Phillip - You're a genius!!! I ran malwarebytes and it resolved my problem. Thank you so much!!!

Firefox won't open/connect tp the internet. Explorer opens and connects. Windows firewall turned off. No other antivirus program running. Happened when I downloaded new Firefox update.

Firefox won't open/connect tp the internet. Explorer opens and connects. Windows firewall turned off. No other antivirus program running. Happened when I downloaded new Firefox update.

I had the same problem when i dl-ed a new anti-virus softward, but what I did help me reconnect Firefox again!
Here is what I did,
Go to open firefox browser-->option-->advanced-->network-->settings-->and change it to auto-detect proxy settings for this network!
It worked for you, hope it will work for you too =)!
Cheers

Firefox won't open because it says it is already open when it ain't

Firefox won't open because it says it is already open. It appears Firefox is operating in the background. Tried to remove it but we get the same message to log out of Firefox. For 10 years we have been using McAfee with all features but it does not detect any virus or malaware etc. It appears it might be a malaware problem but even using all the latest Microsoft fixes hasn't helped. We used Vista Business Professional with all the latest service packs updated. We use the latest version of Firefox as of up to around 3 weeks or so ago when this issue first appeared.

I suspect you need more expert help but here are a few things you can try.
If you can't open Firefox(double click on Firefox desktop icon) try Safe Mode - Hold down the Shift Key as you double click on the icon>don't check anything on the page that opens>continue. If Firefox opens and works in this safe mode go to Add-ons> Extensions and look for "Ask". Then look at Add-ons >Plug-ins and again look for "Ask" . Remove, delete,disable any Asks. If you do remove any, close Firefox. And try again in Normal Mode.
The Ask website has detailed instructions for removal but you need to find it on your computer and have your computer in working order.
If there is no sign of Ask and Firefox is working well in Safe Mode you should work your way through this -
https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
Eventually you might need to grapple with About:Config and even your Windows Registry but I would recommend a complete uninstall and re-install before that. Unfortunately that often doesn't work.
That all sounds very daunting but taken step-by-step you might get lucky early.

TB won't open even though Task Manager says its running. Why?

Windows 8.1.
TB worked fine 'til few days ago.
Now it won't open even though Task Manager indicates it's running.

It is possible that your security software (firewall, anti-virus) blocks or restricts Thunderbird without informing you, possibly after detecting changes (update) to the Firefox program.
Remove all rules for Thunderbird and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full, unrestricted, access to internet for Thunderbird.
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

Firefox won't open when prompted the first time. Says "Not Responding". I have to hit cntrl/alt/del then try starting again. Sometimes multiple times.

Firefox won't open when prompted the first time. Says "Not Responding". I have to hit cntrl/alt/del then try starting again. Sometimes multiple times.

Sounds like a "hang at exit" problem. There are several possible causes for that error. See:
* How to stop the running Firefox process
** In Task Manager, does firefox.exe show in the '''Processes''' tab?
** See: http://kb.mozillazine.org/Kill_application
* What may cause Firefox to hang at exit
** http://support.mozilla.com/en-US/kb/Firefox+hangs (see "Hang at exit" section)
** http://kb.mozillazine.org/Firefox_hangs
** https://support.mozilla.com/en-US/kb/Firefox+is+already+running+but+is+not+responding
* You may need to try Firefox Safe Mode
** You may need to use '''Safe Mode''' to locate the problem: http://support.mozilla.com/en-US/kb/Safe+Mode
**Firefox Safe Mode is a diagnostic mode that disables Extensions and some other features of Firefox. If you are using a theme, switch to the DEFAULT theme: Tools > Add-ons > Themes '''before''' starting Safe Mode. When entering Safe Mode, do not check any items on the entry window, just click "Continue in Safe Mode". Test to see if the problem you are experiencing is corrected.
** If the problem does not occur in Safe-mode then disable all of your Extensions and Plug-ins and then try to find which is causing it by enabling '''one at a time''' until the problem reappears. '''You MUST close and restart Firefox after EACH change''' via File > Restart Firefox (on Mac: Firefox > Quit). You can use "Disable all add-ons" on the Safe mode start window.
** See the following for more information
*** http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes
*** http://support.mozilla.com/en-US/kb/Troubleshooting+plugins
*** http://support.mozilla.com/en-US/kb/Basic+Troubleshooting

I-Photo won't open even though I have upgraded to OS X Yosemite and downloaded the I-Photo upgrader. The upgrades indicate they were successful but I still get an error message when I try to open I-Photo telling me I need to prepare the library

I-Photo won't open even though I have upgraded to OS X Yosemite and downloaded the I-Photo upgrader. The upgrades indicate they were successful but I still get an error message when I try to open I-Photo telling me I need to prepare the library

I-Photo won't open even though I have upgraded to OS X Yosemite and downloaded the I-Photo upgrader.
But have you run the the iPhoto Library upgrader? It is installed in Applications > Utilities. Launch it and direct it to your iPhoto library.
Which version of iPhoto did you upgrade from?
The upgrader is only necessary, if you have been running iPhoto7.1.2 or earlier.

Firefox won't open even when running.

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