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.

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Firefox will not start. its not running in task manager and i dont have norton or skype. it ran yesterday when i updated to it now today it wont start

i had an older 3.somthing version of firefox it worked perfect. i updated to yesterday i loved it but today it just wil not open no errors nothing click on it and theres an hour glass then nothing. i went through you trouble shooting list as i said before but nothing matches this.

hello justin, thanks for reporting with your crash report ID. ironically this issue might be caused by a recent windows update (KB2670838). until there's a fix for it or an updated graphics driver that can solve the issue, please disable hardware acceleration in firefox.
while in safemode go to ''firefox > options > advanced > general'' & switch off hardware acceleration.

Firefox 3.6.9 doesn't open but is running in task manager

I received Animalware via µTorrent and was very busy cleaning up. I changed from AVG (because it let it slip by) to Avira Anti-Vir, ran MalwareBytes Anti-Malware, among other threat removers. In the beginning, none of the current browsers, as well as Outlook Express, were able to connect, but as I progressed with the cleaning operation, IE, Chrome, Safari & Outlook Express were able to connect. Firefox still doesn't open and displays no errors, but runs in Task Manager using 95% of the CPU. I am also running online scans from Trend Micro, Panda and bitDefender. Meanwhile, if anyone has any other suggestions, I would be very thankful.

Make sure that you do not remove your personal data when you uninstall Firefox. Then you won't lose personal data stored in a different location in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder].
See also http://kb.mozillazine.org/Profile_backup and [[Backing up your information]]
A possible cause is security software (firewall) that blocks Firefox. 
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
See also http://kb.mozillazine.org/Browser_will_not_start_up
Do a malware check with a few malware scan programs. 
You need to use all programs because each detects different malware. 
Make sure that you update each program to get the latest version of the database. 
*http://www.malwarebytes.org/mbam.php - Malwarebytes' Anti-Malware
*http://www.superantispyware.com/ - SuperAntispyware
*http://www.safer-networking.org/en/index.html - Spybot Search & Destroy
*http://www.lavasoft.com/products/ad_aware_free.php - Ad-Aware Free
*http://www.microsoft.com/windows/products/winfamily/defender/default.mspx - Windows Defender: Home Page
See also "Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked and [[Searches are redirected to another site]]

Firefox won't start, but possible to troubleshoot as compatibility. how can I fix this without running compatibility?

2014 April 29, Firefox works fine but April 30 it won't start, the possible to work is running compatibility (troubleshoot). Is there any solution for this without running compatibility or without formatting computer? And works during 2014 April 29.
I've already uninstall anti virus
I try also restore and repair windows
I've also uninstall and reinstall firefox.
still doesn't work :(

If you had an update of Firefox, the firewall may be the problem. 
This problem occurs when your Internet security program was set to trust the
previous version of Firefox, but no longer recognizes your updated version as
trusted. Now how to fix the problem: To allow Firefox to connect to the Internet
again: 
* Make sure your Internet security software is up-to-date (i.e. you are running the latest version) 
* Remove Firefox from your program's list of trusted or recognized programs, then add it back. For detailed instructions, see Configure firewalls so that Firefox can access the Internet.

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

Update 7.43 to 7.6 - iTunes won't start but have iTunes.exe Task

Hi There!
I updated my Company-Computer from iTunes 7.4.3 to 7.6 and now iTunes won't start.
All it does is: It shows the waitcursor for a few seconds and I get a Task in the Taskmanager that says iTunes.exe
But it won't show the EULA where I am asked to accept Apples Terms.
I updated my Laptop too and that works fine.
I checked all the Services that where running (on both systems) and they where identical.
What else could prevent the EULA window from appering? And if I acceped the EULA would iTunes start ok?
Has anyone had the same problem and what could I do?
So far I deinstalled iTunes and everything else (AppleLike) and cleaned the registry of all iTunes and Quicktime branches. After a reboot I installed it again - so far it didn't help.
Has anyone an idea what I could try else (reinstalling windows ist out of the question since it is may workplace PC; everything else works fine.
Thanks in advance
René

Hey Everyone,
I am going to add to the long list of outrage. I JUST purchased (like literally...9 hours ago...) an 8GB iPod Touch and after installation I ran into the EXACT same problem. Since I am a new owner this is the first time I have iTunes installed on my computer. So of course I downloaded the most recent version (as instructed). Like everyone else in this thread is saying, you try to open up the iTunes application but the GUI doesn't appear at all. Apparently "something" is running because its process is active in the Task manager but there is nothing on my screen! What's the problem here??? I've done everything short of reinstalling XP (thats actually kind of unnecessary as you shouldn't have to uninstall an entire OS just to get an application to work...update files or clean the registry--sure...uninstall then reinstall--no..). Yes, obviously this is an Apple product so there won't be many (if any) conflicts when connecting to an Apple device (like a Macbook). But seriously guys....seriously???
What is more outrageous to me, besides the fact that this is a widespread problem...is the fact that this is a CURRENT problem that has YET to be even identified or rectified by anyone from Apple. I went on this forum, thinking that this was some known occurrence that happened maybe months ago and could be fixed immediately--but I am viewing messages from this week and even TODAY!
This is absolutely unacceptable. Who needs to be contacted concerning conflict resolution with Apple hardware? Or does Apple wish to have another iPhone-esque debacle like a few months ago?
Not to be rude, but I am not the average user that knows nothing about software and/or hardware (as I'm sure alot of others are knowledgeable). I am not "that person" that doesn't plug in the computer into the outlet then wonders why its not working. I don't mean to come here with an air of anger but this is truly ridiculous...lets get the ball rolling on a fix or start drafting up those $299.99 refunds...

Firefox don't open but it apears in task manager

When i click on firefox icon... nothing happens. I'll go to task manager and there it is... firefox. But it won't open...

It is possible that your security software (firewall, anti-virus) 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 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 install 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
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating

I have windows 7 and my firefox client will not open, but it shows in task manager with 108k memory. Whats going on with my firefox?

As stated on the question I have windows 7 and meet all the requirements. But when i launch firefox It wont start, but it shows in task manager with 108k memory.

Got the exact same problem aswell, finally fed up with it now as i just started up firefox and 14 new windows opened because of this bug, luckily my computer can handle them but someone with a slower processor it would have been a nightmare, needs fixing ASAP.
Reverting back to 3.6.3 until this issue is solved. (link for anyone wanting to do the same below)
http://www.filehippo.com/download_firefox/7345/

My computer crashed and I cant reload firefox.. I have tried the task manager and deleting uninstalling and installing program again. I click on icon and nothing appears although is running in task manager

My computer crashed and I cant reload firefox.. I have tried the task manager and deleting uninstalling and installing program again. I click on icon and nothing appears although it appears to start and is running in task manager, but the browser wont open.

See:
*http://kb.mozillazine.org/Browser_will_not_start_up
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.com/kb/Server+not+found
*https://support.mozilla.com/kb/Firewalls

After reboot firefox won't start. runs in task manager, but won't pop up. reset, safe mode and uninstall/re-install won't help. ok if no reboot.

win7 Pro. has been running firefox ok. but lately with 25 and now 26, the firefox won't start. I can see firefox is running in task manager. but it just won't pop up.
if I download it again and install it, it will run, but every time I reboot the system, it just won't run again.
try: reset, safe mode, uninstall & reinstall, new/clean profile, none of those work.

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 won't start, there is no error message and it is not already running.

Hi,
When I try to click on firefox, the little wait icon appears and then disappears. Nothing opens, not even safe mode. I've looked at the "Firefox won't start and there is no error message" help section and looked at my task manager processes. It seems that when I click firefox, it briefly appears on my processes and then disappears. This happened yesterday while I was in the middle of using it. At the same time, my Skype also crashed, which makes me think the two are correlated. The two programs still don't work. The only way that I can open firefox is if I install it all over again with the "launch firefox now" option checked at the end. When I have a firefox window open, I can open other firefox windows just fine. When I close it, nothing opens. Thanks for your help.

1) Start Task Manager
2) Open Processes (make the description area large enough to see)
3) look for a description that says ''firefox''
4) Select it and press End Process
'''Now Firefox should work properly.'''

Firefox update failed, so I re-installed. Now firefox won't start up at all?

''locking as a duplicate of https://support.mozilla.org/en-US/questions/969557''
So I ran firefox, and it was updating. While updating, firefox crashed for no apparent reason so I had to close it. Afterwards, every time I tried to start up firefox, it gave me the update failed error, followed by a crash less than a second later. I followed some instructions, uninstalling and re-installing firefox (without removing personal data), but now firefox won't start up at all!
Now what?

We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.
#Press the following shortcut to get a Run window: [Windows] + [R]. This should bring up a window that contains a text field.
#In that text field, enter %APPDATA% and press Enter. An explorer window should open.
#From that explorer window, double-click on the ''Mozilla'' folder, then double-click on ''Firefox'' and then on ''Crash reports''. Double-click on ''submitted''.
#Now, you should see a list of files that contain reports. Go to ''View'' > ''Arrange Icons by'' > ''Modified'' to get the most recent files at the top of the window.
#Open the most recent 5 files with a text editor and copy the IDs.
#Paste each ID with '''bp-''' into the reply window on the forums.
Thanks in advance!
You can find more information and troubleshooting steps in the [[Firefox crashes]] article.

Firefox won't start (not even in Safe Mode) on Windows 7 x64

I am Running Windows 7 x64 and Firefox 3.6.15.
Since the day before yesterday I am unable to start Firefox. Even in Safe Mode it just won't start.
I click the Firefox icon, the mouse cursor changes to indicate the computer is doing something. After 3 seconds or so the mouse cursor again changes back to its default state. Nothing else happens.
The Task Manager in Windows shows me that an instance of firefox.exe is running, but I see no Firefox window.
Then if I again click to open Firefox, another firefox.exe instance starts, but again I see no Firefox window.
There isn't even a warning about one instance of Firefox already running.
What I have tried:
I have uninstalled Firefox, removed all the Firefox files and folders from c:\users\username\AppData\Local and Roamning. I re-downloaded the 3.6.15 installation package and re-installed.
No change.

I have the same problem.
The only Firefox version working is the 64bit nightly build 6.0a1. No 32Bit version of Firefox works!. Chrome, Safari and Internet Explorer all work well.
Another Problem I have in this context is, that the Firefox Installer hangs in the tidy up step - even for the nightly 64Bit version. I have to kill the setup.exe process but the Installation seems to be completed.
Before my change to Win7 64Bit I had OpenText NFS Solo 14 installed on a 32Bit Windows7 and no Problems.
Is there a solution for this problem without uninstalling OpenText NFS Solo 14?
I need the NFS Server at work.

Firefox won't start. Everytime I end the process/close the last window, it keeps getting stuck at about 2500k memory in the task manager. (continued)

Firefox won't start. Everytime I end the process/close the last window, it keeps getting stuck at about 2500k memory in the task manager. The only way I have to fix it is to change some kind of compability settings or try and access it in a new way, and every time it crashes/closed/computer blue screens that setting will no longer work.
That is a short term solution, but eventually I'll run out of ways to access firefox successfully. I've tried many solutions, and some worked, but only once. I have yet to find a permanent solution for this problem.

First please update your plugins to make sure you are up to date. Shockwave Flash player has a newer version 16. In order to better manage the memory that Firefox uses please see these troubleshooting steps: [https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram Firefox Uses too much RAM]
You also mentioned that Firefox crashes, we're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash IDs to help us learn more about your crash.
#Enter ''about:crashes'' in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
#Copy the '''5''' most recent Report IDs that start with '''bp-''' and then go back to your forum question and paste those IDs into the "Post a Reply" box.
''' Note:''' If a recent Report ID does not start with '''bp-''' click on it and select '''Submit'''.
(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)
;[[Image:aboutcrashesFx29|width=500]]
Thank you for your help!
More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.

Firefox won't start; no error message; profile manager also won't start. What can I do?

Suddenly, firefox won't start. I get no error message--it just won't open. System restore to a month before the problem did not help.
From the suggestions on this page: http://support.mozilla.com/en-US/kb/Firefox%20will%20not%20start... I did not recently install add-ons or clean the registry, so I think it may be a profile problem. But profile manager will not open--only a tiny window with a white rectangle and no text.
I would like to not lose all my bookmarks. And I would like to continue using Firefox.
What can I do?

dmcritchie, thank you for your reply!
Before I received your response, I tried something that seems to have worked. I used Chrome to go to the Firefox website and downloaded Firefox (without uninstalling it first) and went through the installation process again. For some reason, this worked, even though I already had the latest version of Firefox, and I can now open Firefox successfully.
If it stops working again, I will try your suggestion. In the meantime, thank you much!

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

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