Firefox wont start v5.0.1

Firefox has been running a long long time without problems. Now, it won't start. Reboot between each
try. Tried safemode, tried run as administer (comes up with do you wont the following program to make a change....) tried deinstalling and reinstalling, created a new profile. using avast and malware bytes
and have scanned with both. Loaded the software down from Major Geeks site. removed any software
that had been installed this month.

Since you have tried many ways, why don't you try the latest version of firefox? It's currently firefox v28 on release channel.

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Firefox wont start "XPCOM" message pops up, need my user and passwords!!??

My window 7 wasn't starting up properly so I did a system restore and now firefox wont start a message pops up stating "XPCOM" and I googled it and everything is telling to reinstall Firefox. I don't wont to reinstall it just yet because I need my passwords and username back. I cant find a solution on the forums either, or if there is I haven't found it or I simply didn't understood the solution itself. Please get back to me asap
thank you!

This usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder.
Do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.
*Download the full Firefox installer and save the file to the desktop https://www.mozilla.org/en-US/firefox/all/
If possible uninstall your current Firefox version to cleanup the Windows registry and settings in security software.
*Do NOT remove "personal data" when you uninstall your current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including data in profiles created by other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.
*(32 bit Windows) "C:\Program Files\Mozilla Firefox\"
*(64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"
*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.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.
If you keep having problems then also create a new profile.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

I ended a host proces and now firefox wont start up Help?

Well Before this everything was fine but now, after i ended a host process (dont know wich one) i open up firefox and it just stays still or frozen and so it wont start up,
I tries restarting the laptop a couple times but nothing.
Id like to also know maybe how to restart that host process i ended thanks.

Try to ask advice on a Windows oriented forum.
* http://www.bleepingcomputer.com/forums/ - BleepingComputer.com - Computer Help Forums
* http://windowssecrets.com/forums/ Windows Secrets Lounge

Firefox wont start on my win xp computer

I am running windows xp professional. I have had firefox for years. When I uploaded the latest upgrade, the program quit working. I have installed different versions, all with thesame result. The program refuses to stat when I click the icon on the latest version.

Most commonly, Firefox not starting after upgrading is related to your firewall/security software. You may need to delete Firefox from your allowed programs list in your firewall, allow the firewall to re-detect the new version of Firefox, and give it the permissions needed to connect to the internet. 
See: http://support.mozilla.com/en-US/kb/Cannot+connect+after+upgrading+Firefox

Mozilla firefox wont start because of read confirgaration

I have reinstalled mozilla firefox and I still have the same problem.It say wont read confiration

Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox and any leftover program files and then reinstall Firefox. Please follow these steps one by one:
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu) and confirm all upcoming messages.
#Now, uninstall Firefox by following the steps mentioned in the [[Uninstall Firefox from your computer#w_uninstall-firefox|Uninstall Firefox]] article.
'''IMPORTANT:''' On Windows, the uninstaller has the option to remove your personal data and settings. Make sure that you do '''not''' check this option; otherwise all of your bookmarks, passwords, extensions, user customizations and other Firefox [[Profiles|user profile data]] will be removed from your computer.
After uninstalling Firefox on Windows, delete the "Mozilla Firefox" program folder, located by default in one of these locations:
* '''(On 32-bit Windows)''' ''C:\Program Files\Mozilla Firefox''
* '''(On 64-bit Windows)''' ''C:\Program Files (x86)\Mozilla Firefox''
#Go to the Windows Start menu and click on "Computer".
#In the Explorer window that opens, double click Local Disk (C:) to open the C:\ drive.
#Find the "Program Files (x86)" folder or "Program Files" folder.
#* On 32-bit Windows, double-click the '''Program Files''' folder to open it.
#* On 64-bit Windows, you will see a "Program Files (x86)" folder AND a "Program Files" folder. Open the '''Program Files (x86)''' folder.
#Look for a '''Mozilla Firefox''' folder. If you find one, right-click it and select ''Delete'' and confirm that you want to move the folder to the Recycle Bin.
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.
Please report back to see if this helped you!

After i insalled a keylogger, firefox wont start anymore. i've already unninstalled the keylogger and scanned my computer with 3 antispyware, there's nothing more on my computer, but still, firefox crashs everytime i try to open it. please help me

I get this report everytime i try to open firefox:
AdapterDeviceID: 9490
AdapterVendorID: 1002
Add-ons: {5F590AA2-1221-4113-A6F4-A4BB62414FAC}:0.45.6.20100202.1,{89506680-e3f4-484c-a2c0-ed711d481eda}:0.9.5.6,[email protected]:1.1.1,{6F0976E6-26F3-4AFE-BBEC-9E99E27E4DF3}:1.4.14,{a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}:20110323,wikilook@testpilot:2.7.0,[email protected]:4.0.20110415,{EF522540-89F5-46b9-B6FE-1829E2B572C6}:5.0.3,{b9db16a4-6edc-47ec-a1f4-b86292ed211d}:4.9.3,{46551EC9-40F0-4e47-8E18-8E5CF550CFB8}:1.2,{CAFEEFAC-0016-0000-0022-ABCDEFFEDCBA}:6.0.22,{CAFEEFAC-0016-0000-0023-ABCDEFFEDCBA}:6.0.23,{CAFEEFAC-0016-0000-0024-ABCDEFFEDCBA}:6.0.24,{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}:1.3.9,{CAFEEFAC-0016-0000-0026-ABCDEFFEDCBA}:6.0.26,{cc85cd4e-5a5b-4eda-a25c-bdaffa93b406}:0.7,{972ce4c6-7e08-4474-a285-3208198ce6fd}:5.0
AvailableVirtualMemory: 4115996672
BuildID: 20110615151330
CrashTime: 1309981062
EMCheckCompatibility: true
FramePoisonBase: 00000000f0de0000
FramePoisonSize: 65536
InstallTime: 1308935344
Notes: AdapterVendorID: 1002, AdapterDeviceID: 9490, AdapterDriverVersion: 8.632.1.2000
ProductName: Firefox
ReleaseChannel: release
SecondsSinceLastCrash: 636
StartupTime: 1309981057
SystemMemoryUsePercentage: 63
Theme: classic/1.0
Throttleable: 1
TotalVirtualMemory: 4294836224
URL:
Vendor: Mozilla
Version: 5.0
Winsock_LSP: Tcpip MSAFD [TCP/IP] : 2 : 1 :
Tcpip MSAFD [UDP/IP] : 2 : 2 : %SystemRoot%\system32\mswsock.dll
Tcpip MSAFD [RAW/IP] : 2 : 3 :
MSAFD Tcpip [TCP/IPv6] : 2 : 1 : %SystemRoot%\system32\mswsock.dll
MSAFD Tcpip [UDP/IPv6] : 2 : 2 :
MSAFD Tcpip [RAW/IPv6] : 2 : 3 : %SystemRoot%\system32\mswsock.dll
Provedor de Serviço de TCPv6 de RSVP : 2 : 1 :
Provedor de Serviço de TCP de RSVP : 2 : 1 : %SystemRoot%\system32\mswsock.dll
Provedor de Serviço de UDPv6 de RSVP : 2 : 2 :
Provedor de Serviço de UDP de RSVP : 2 : 2 : %SystemRoot%\system32\mswsock.dll
MSAFD RfComm [Bluetooth] : 2 : 1 :

Can you start Firefox in [[Safe mode]] ?
You can also do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that 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.
You can initially skip the step to create a new profile, that may not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Firefox wont start, all soloutions given on website do not work

I am using Windows XP and the most recent version of Firefox. I was browsing last night and had multiple pages open (the websites were bbc.co.uk, eurogamer.co.uk, ign.co.uk). I clicked on a link for an article and the page started behaving strangely, like it was being re-directed so I closed it immediately. All of my open pages then disappeared completely. I received no error messages or acknowledgement of what had happened so I decided to simply re-load. Now, when I click on the Firefox icon I get nothing, no browser, no error messages. When I check my task manager there are no open Firefox processes. I have tried un-installing and re-installing but even that does not work. I can still open internet explorer so I know my internet connection is working ok. I have tried everything suggested on the official Firefox website but still nothing. Does anyone have any ideas, any help would be greatly appreciate.
== This happened ==
Every time Firefox opened
== 29/05/2010 ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; OfficeLiveConnector.1.3; OfficeLivePatch.0.0)

I have the exact same problem. Firefox has been my default browser forever. Was trying to load Sorority life, an app on Facebook. Although FaceBook loaded, SL wouldn't. After doing all the cache clean up ect that was reccommended, and still not able to load the game, I ended up removing and reloading FireFox Once I re-loaded, nothing. I don't care how many times I try to load it, I get absolutely nothing.

Firefox wont start or load but when I press ctl, alt, delete I see it running?

I upgraded Firefox. I worked for one night, the next night When I tried to open it it didnt work. I press ctl alt delete and noticed that it was running in the background but no window... IE and Chrome works fine... I do have internet.
I ran virus scans with no problems what so ever. Ran malwarebites and no issues. I have the windows firefall and disabaled it to see if maybe thats the problem, I also checked to see if Firefox had permission to pass the firewall and those were no issues.
Any Ideas.. please help.

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
See also:
* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Firefox_hangs

Firefox wont start. Gives error: The procedure entry point PL_ClearArenaPod could not be located in plds4.dll

Complete text of error message when attempting to start Firefox.
The procedure entry point PL_Clear ArenaPod could not be located in the dynamic link library plds4.dll
Firefox never opens before or after the error message.
After I close the error message window, I also get message from ZoneAlarm (my security software) asking me to send them an error report.
I had just accepted an automatic update from Firefox prior to the problems occurring.

Do a clean reinstall and download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
Uninstall your current Firefox version and remove the Firefox program folder before installing that 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.
You can skip the step to create a new profile, that is not necessary for this issue.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Firefox wont start after overnight XP patch installation

Overnight XP installed a patch and rebooted my PC. This morning I can't get Friefox to start. I looked for the xpicleanup.dat file using the instructions here (search hidden files etc) but search ends without locating the file. Does anyone know where Firefox parks this file normally? If not I am not sure what to do next?

* Start Firefox in Safe Mode by Holding down the SHIFT key while starting Firefox
* As an alternative method, select "Start -> Run" and enter one of the following in the Windows Run box:
** firefox -safe-mode
** "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode
-> Firefox Safe Mode window will appear -> DON'T SELECT ANY OPTIONS, just click '''Continue in Safe Mode'''
-> Troubleshooting extensions and themes
* https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
Check and tell if its working.

Firefox wont start after 1st install session.

Some time ago firefox updated, after update it crashed on startup when checking add on compatibility. After this crash it never started again.
I uninstalled and re installed and it started fine after install, but when i close it and try to open again it doesn't start. The process is there and stuck at 13 cpu usage with memory usage around 15k.
Every time it starts after the initial install it says "The bookmarks and history system will not be functional because firefox is being used by another application" i have no idea what may be using it, microsoft security essentials is the closest thing to anti vir installed.
I uninstalled and reinstalled multiple times, deleting all files including registry files but its the same issue, for the past few months i've been using Chrome and now after months of torture i want my Firefox back! Help!

* Start Firefox in Safe Mode by Holding down the SHIFT key while starting Firefox
* As an alternative method, select "Start -> Run" and enter one of the following in the Windows Run box:
** firefox -safe-mode
** "C:\Program Files\Mozilla Firefox\firefox.exe" -safe-mode
-> Firefox Safe Mode window will appear -> DON'T SELECT ANY OPTIONS, just click '''Continue in Safe Mode'''
-> Troubleshooting extensions and themes
* https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
Check and tell if its working.

Deleted profile and firefox wont start (although it says it's running)

I was having a problem with firefox on my mac running osx 10.7.5 and the solution I read said my profile may be corrupt so I deleted it. Then I deleted firefox and reinstalled it. Now it says I am missing my profile and it won't start at all. I am writing this using another application as I can't get Firefox to run.
Thanks!

Hi shinyperson, 
maybe you should try starting the Profile Manager.
 This article nay be useful: 
[[Use the Profile Manager to create and remove Firefox profiles]]
 
Also, have a look at this page: 
[http://kb.mozillazine.org/Profile_Manager Profile Manager]

Firefox wont start

After installing Firefox 4 it would no longer start. I have uninstalled it it, deleted registry keys, deleted program directory, profile directory, etc. Reinstalled and still will only run in the processes. Will not open up. I have tried everything mentioned on online and still have the problems.
Any suggestions? Even tried 3.6 and it will not work. Even safe mode does not work.

By 4.0 Beta 2, I am assuming you mean 4.0b2pre (Minefield)?
This is a known issue: https://bugzilla.mozilla.org/show_bug.cgi?id=577486
You can follow that bug to find out when it is fixed. Until then you can revert to a previous nightly.

Firefox wont start - the choose use profile box is black.

Firefox won't start. I get a blank "Choose User Profile" window. This is on Windows 7. Tried uninstalling, deleting the old profiles (c:\users\<username>\AppData\Local\Mozilla) and reinstalling with the same result.

hello Flumpy, other users with this problem all had an embedded intel hd3000 graphics card with an old driver present. in case this also applies to you, here would be a link to update the driver, which in turn should also address the black firefox problem: https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23764 (for win7 64 bit)
in case this doesn't solve the issue or does not apply to your system, start firefox into safemode '''by pressing the shift key while the application is launching''' & disable hardware acceleration in the firefox ''menu ≡ > options > advanced > general'' (that setting will take a restart of the browser to take effect).
[[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]

Firefox wont start (no message). Firefox wont uninstall (no message)

Firefox will not start. The hour-glass appears momentarily, then disappears followed by boom sound effect. There is no error message. Task manager never sees Firefox loaded.
Then when I try to uninstall Firefox, when I click Remove, again hour-glass appears momentarily, then silently disappears. I am running Windows XP.

A boom sound effect? Are you sure you're trying to run Firefox? I've never heard of that happening. But let's try a few methods. Each will be separated by a horizontal line.
'''Try Firefox Safe Mode''' to see if the problem goes away. [[Troubleshoot Firefox issues using Safe Mode|Firefox Safe Mode]] is a troubleshooting mode that turns off some settings and disables most add-ons (extensions and themes).
''(If you're using an added theme, switch to the Default theme.)''
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu by clicking on the '''Restart with Add-ons Disabled...''' menu item: 
[[Image:FirefoxSafeMode|width=520]] 
If Firefox is not running, you can start Firefox in Safe Mode as follows:
* On Windows: Hold the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* On Mac: Hold the '''option''' key while starting Firefox.
* On Linux: Quit Firefox, go to your Terminal and run ''firefox -safe-mode'' (you may need to specify the Firefox installation path e.g. /usr/lib/firefox)
''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article to find the cause.
''To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
----

Firefox wont start v5.0.1

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