Firefox begins to start but then stops before loading any screen. Profile manager/safe mode appear then disappear. Task manager shows programs briefly in CPU then they disappear. Uninstall & reload makes no difference. Any ideas please ?

When we clicked as usual on the firefox icon the egg-timer started then went off. Nothing started up.
Checking the Task Manager showed firefox.exe briefly using the CPU then it dropped off the list.
We tried to uninstall and reload from the mozilla site (http://www.mozilla-europe.org/en/firefox/). Installation seemed to work ok, but the same problem recurred when we tried to start firefox.
Did this again, this time removing bookmarks, etc. same result.
Tried to use the profile manager - the screen came up but disappeared before we could use it.
Same thing happened when we tried to start in safe mode - screen briefly appeared but then disappeared.
Tried googling in IE to solve the problem but nothing seems to apply.
Have run all security checks but no apparent bugs or problems.
Have had to abandon firefox and use another browser. How do we get it back please ?

Did you check your security software (firewall)?
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, 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.
See [[Server not found]] and [[Firewalls]] and http://kb.mozillazine.org/Firewalls

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Firefox will not start in normal (hour glass for a second) or in safe mode (closes after choice box).

Firefox will not start in normal (hour glass for a second) or in safe mode (closes after choice box).
I tried all of the following with no success:
- uninstalling and reinstalling mozilla with no success.
- End all firefox.exe from the task manager and then open again the firefox from quick launch or desktop or program files folder.
- Change the firefox.exe name to firefox2.exe
- Start in safe mode and choose several alternatives after choice box, but nothing happen.
Please help.

What is your computer system, and what Firefox are you using?
Start your '''Computer''' in safe mode. Then start Firefox. Try '''Safe''' web sites.
'''[http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting The Computer In Safe Mode; Free Online Encyclopedia]'''

I frequently find that when closing Firefox, and try to reopen again, get error message "Firefox is already running, but not responding. Recommend to close it, or restart system". Using Windows Task Manager, no application is found. After restart, OK.

At the update to Firefox 3.6.8, I also updated to Flash 10.

I get this problem often, on my computer which runs XP, I find simply waiting a few moments (up to a minute) is enough to end the process.
On my Vista machine, it sometimes works that way, but if FF locked up (stopped) and is ended through the task manager, it often requires a reboot or a much longer wait (up to 10 minutes or more).

After updating Firefox to 3.6.14 it will not start, not even in safe mode after rebooting. Task Manager shows no Firefox running. I tried uninstalling Firefox & then reinstalling it. Stll won't start.

I get only an error message: " XULRunner-
Error: Platform version 1.9.2.13 is not compatible with minVersion >=1.9.2.14
maxVersion<=1.9.2.14 "
My system: Windows XP
I've tried the tips on the Firefox help pages.

I withdraw my 'I have this problem too'. My error was different, but a restart fixed whatever it was.

My firefox starts and works normally for a while then all of a sudden it switches to safe mode. I restart the computer and the same thing happens again.

When I restart the computer as before it works normally for a few minutes then all of a sudden it's in safe mode again. It just started doing this a few days ago, I never had a problem before and it's really annoying as I end up having to restart my computer every few minutes.

Try to update firefox to the latest 12.0 and check it again. If you have the problem again try to a new profile see: [http://support.mozilla.org/en-US/kb/Managing-profiles Managing profiles] , see also: [http://support.mozilla.org/en-US/kb/Profiles Profiles] .
thank you
Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

Popup window "Firefox Safe Mode" came up."Firefox is now running in Safe Mode, which temporarily disables your custom settings, themes, and extensions". Then lists items 4 which some/all changes can be made permanent.

Pop up window: "Firefox Safe Mode". says: "Firefox is now running in Safe Mode, which temporarily disables your custom settings, themes an extensions". Then it shows list of items to select to make changes. Final choice press on "Continue in Safe Mode" or "quit". We do not want to make any changes to our settings. Pls. help what does this mean and what should we do. Thank you

On what kind of computer (Operating System) and with which Firefox version does this happen?
You seem to have posted this question with a iPad according to the system details list.
*http://kb.mozillazine.org/Safe_Mode
*http://support.mozilla.org/kb/Firefox+is+stuck+in+Safe+Mode

Having more than four tabs open causes Firefox to become non-responsive, lagging for sometimes up to 5 minutes and can't close it without task manager.

If I try to open a fifth tab, or try to pin a tab Firefox mutes, or whites out and the mouse freezes. When this happens the title bar states that it is, "unresponsive." I either have to wait until it starts moving again to restart it because I have no close button, and this takes up to 5 minutes and sometimes even more, or I have to crash it using the task manager (ctrl + alt + del) when it takes longer. Also, any time I try to pin a tab it does the same thing with a single pinned tab. If I try to open firefox after a crash, it immediately becomes unresponsive for an even longer time.

Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Firefox won't start, but is running in Task Manager

I was running 3.x for a long time with no troubles.
Last week it crashed, and since then I have been unable to start Firefox although it is showing as running in the Task Manager when I attempt to start it.
So it opens no window, but appears to be running.
Same for Safe Mode.
Same for Profile Manager.
Can't use switch to from task manager.
I uninstalled 3.x and deleted all mention of Firefox or Mozilla from the registry.
I installed 4, and still have the exact same problems.
Running XP with a load of business apps, but nothing installed recently.

There may be a corrupted file on Firefox. 
Please attempt to perform a clean reinstall. [https://support.mozilla.org/en-US/kb/forum-response-clean-reinstall (More Details)] This is different than a regular uninstall.
If a clean reinstall does not fix the issue, please try starting your operating system in safe mode. 
To do so, please do the following:
#Ensure that your computer is shut down completely
#Press the power button
#Tap the <code>F8</code> key repeatedly before the Windows logo and startup screen is displayed
#Select Safe Mode With Networking for the advanced startup options list
Please report back with the results of both solutions.

Firefox process is starting, but no activity and no active application

I am already for long-time a happy firefox user. I rate myself as an experienced firefox user and troubleshooter. But today I got some unfixable problems, and also can not find my problem in the forums. Ony this tread is a bit related, but offers no solution : https://support.mozilla.com/nl/questions/759683
The firefox.exe process starts, loads till about 10MB in memory and than no activity. Also no CPU usage. Appears to be hang.
If I remove js3250.dll there is an error message that the file can not be found. So I guess the basics of FF are started.
The profiles are already moved to an other location. Later I uninstalled FF. Several times rebooted. Moved ALL references in program files and in my roaming user profile to a different drive and installed FF again.
Virusscan and Firewall software are disabled at the moment.
Unfortunately FF keeps responding in the same way. Only starting firefox.exe as a visible process but as application not visible. and no activity after a few seconds (ca. 10 MB in memory)
Hope the cure can be found soon. I like Chrome less than FF... Other browsers even less ;-|

''The version of Comodo I am working with is version 5.3.xxx''.
Even so, the "Comodo Safe Surf" component may still be installed from an earlier (pre 3.1o) version of Comodo. You should still make sure that you don't see "Comodo Safe Surf" in the Windows Control panel program list of installed programs.
''I forgot to mention that even safe-mode will not do anything different.''
If Firefox doesn't start, even in Firefox [[Safe Mode]], and you've already tried a
[http://support.mozilla.com/kb/Basic+Troubleshooting#w_clean-reinstall clean reinstall] (more info on that [http://kb.mozillazine.org/Uninstalling_Firefox#On_Windows here] and [http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall here]):
There are some other possible solutions here:
*[[Basic Troubleshooting#w_other-solutions|Basic Troubleshooting Other solutions]]
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Other_solutions
...including:
* ''[http://kb.mozillazine.org/Kill_application With Firefox completely closed], open the [http://kb.mozillazine.org/Installation_directory application folder] <snip> rename firefox.exe to '''firefox1.exe''' then double-click firefox1.exe. If Firefox runs without problems, it could indicate that your firewall is blocking Firefox <snip>. It may also indicate that some malicious code has targeted Firefox . Note: If [http://kb.mozillazine.org/Firefox.exe_always_open firefox.exe is always open], specific malware may have targeted Firefox if it is set as the [http://kb.mozillazine.org/Default_browser default browser]. ''

My firefox isn't starting and I've tried changing the profile manager but that wouldn't open either even when I closed it out on the task manager

I've followed all the steps in the "Firefox will not start" and it is still not working :(

I'm also having this problem. The firefox.exe ins't even shown in my processes, but the profile manager still won't open. Neither will firefox internet. So far I've been going in circles trying to figure it out and nothing is working. I don't want to start deleting things (the profile, extentions), but I don't know what else to do.

Firefox won't start,but when I shut my computer down it says that it is running. What is the problem?

Firefox will not open, but when I shut my computer down it says that it is running and must be forced quit. Once I rebute the computer it opens but is very slow and hang up on many web pages. I have reinstalled it with little help. In contrast, Windows Internet Explorer works fine.

Did you check your security software (firewall)? 
A possible cause is security software (firewall) that blocks or restricts Firefox without informing you about that, 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. 
See:
* [[Server not found]]
* [[Firewalls]]
See also (Hang at exit):
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]
* http://kb.mozillazine.org/Browser_will_not_start_up

Firefox crashes when you exit it, but it does so on fresh (re)installation, including safe mode. What other information should I provide to identify problem?

I`m running XP SP3, hardware fairly new, bitdefender and Malwarebytes' Anti-Malware says I do not have viruses, and I dont remember installing new software before it started crashing. I uninstalled firefox with deleting preferences, etc. downloaded new firefox installation with IE, installed, but ir does crash on every or nearly every exit, including in safe mode. Can anybody help? I am new here, probably overlooked sth. in existing articles, in this case, I am sorry, and could anybody direct me to it. Thanks

I think it would be a good idea if you performed a clean install. Any corrupt files which are on the system and are causing this problem will be replaced. It's a very simple process and you won't lose any bookmarks. Here's how.
Go to [http://www.mozilla.com/en-US/firefox/fx/?ref=logo Download Firefox 4.0.1] and download to the desktop.
Then go to Add/Remove Programs, scroll down to "Mozilla Firefox" and remove it, choosing to keep your bookmarks, customizations etc., (''don't checkmark the box'').
Then reboot and delete the folder called "Mozilla Firefox" at this location: C:\Program Files\Mozilla Firefox
Finally run the installation file you downloaded to the desktop earlier.
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

Reboot then stop at loading ' Blackberry" bar after 3 quarter loading. :(

My blackberry Torch 9860, always lag . Then i installed an apps named QUICKPULL. the app run just fine with my bb, until yesterday evening, when i tried to reset my bb using quickpull, it rebooted but stop at the loading "blackberry" bar half way.
i also tried to plunged the battery out, and start to turn it on again. nothing happen.
Is this a problem of battery or software?
What cn i do? pleae help me.

Hi and Welcome to the Community!
I recommend that you attempt to boot into Safe Mode:
KB17877 How to start a BlackBerry smartphone in Safe Mode
It may take you multiple attempts to get the ESC key sequence (press/release/hold) correct, so be patient. When successfully into Safe Mode, see what happens.
If the behavior ceases, then think carefully...what happened just before this behavior started? A new app? An update? A Theme? Something else? Think carefully as the smallest change could be causal...and attempt to undo whatever that was.
But if the behavior continues in Safe Mode, then you may need to consider more drastic actions -- WIPE, OS Reload, BBSAK Wipe/Reload, and the "Bare Bones" OS Reload Process. To prepare, you should be sure that you have a full backup to your PC...please review the Backup link in my auto-sig on this post for instructions.
You may also need the use of these tricks:
KB10144 How to force the detection of the BlackBerry smartphone using Application Loader
KB27956 How to recover a BlackBerry smartphone from any state
http://crackberry.com/blackberry-101-lecture-12-how-reload-operating-system-nuked-blackberry
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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Can't Debug in Eclipse - PS starts but Extension doesn't load

Windows 7 Pro
I can create my extension in Eclipse and Export it. Then use Extension Manager to install it and PS sees it......but if I right click on the Project in Eclipse and use 'Debug As', PS starts but the extension doesn't appear in it's list.
I've been through the changes at;
Adobe Extension Builder and Creative Cloud 2014
and carried out the PlayerDebugMode registry entry but my debugging still doesn't work.
If anybody has any ideas I'd be very grateful. My HTML5 and JS headache just doesn't need another problem.
Thank you,
Jen.

Thanks for the reply. I was following along with the video "Building and debugging HTML5 Extensions for Adobe Creative Cloud products" - doing things exactly as in the video (except I choose PS instead of PP. When I right click on my Project name in the Script Explorer in Eclipse and then select 'Debug As' and select PS - PS runs but my extension does not appear in the Windows - > Extensions list.
As I said I have added the PlayerDebugMode registry entry but my extension still doesn't appear in the PS list of Extensions.
Thanks for your thoughts Hallgrimur, appreciate it.
Jen.

When I click on Firefox, it won't open... the icon flashes as if opening but no browser window opens. It also does not appear in the task manager

I click on the icon and it flashes as if opening.... no browser window appears.... I check the task manager to see if it is open but not displayed... nothing in the task manager..
So I uninstalled it leaving my preferences, and reinstalled it but it does the same thing. This time when I went to uninstall it again wiping the preferences away (in case it is those that is causing the problem) the uninstall program said that I had to close firefox first... but it isn't showing up as open in the task manager....
Final though... the last few weeks I have had a page pop up to advertise a need to update this or that, a need to click on this or that... obviously some kind of bug/virus.... help me get firefox going again...
On Windows 7 platform

Boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as a test to see if that helps.
Do a malware check with some malware scanning programs on the Windows computer. 
Please scan with all programs because each program detects different malware. 
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page: http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked

Firefox begins to start but then stops before loading any screen. Profile manager/safe mode appear then disappear. Task manager shows programs briefly in CPU then they disappear. Uninstall & reload makes no difference. Any ideas please ?

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