Firefox won't start, profile manager won't start, but firefox.exe shows in processes list (task manager)

Firefox will not start, even though it is listed in my processes in task manager. Can't get profile manager to start either.
I have tried the following to no avail:
- try to start FF in Safe Mode, doesn't load
- started Windows Vista in Safe Mode, FF still does not load
- turned off Kaspersky AV, FF still does not load
- uninstalled FF, cleaned out user/####/AppData/Mozilla/Firefox folder, as well as ProgramFiles/Mozilla/Firefox folder, and cleaned our Registry manually from all references to Firefox. Downloaded FF 3.6.3, installed. still does not load
- whatever i seem to do, does not fix the problem. When I try to start Firefox, no window appears. I can see the process starting in my task manager. I can "end process" and try to start the program again by double-clicking program icon. Process starts in task manager, but no app window appears.
I am frustrated and have just wasted 2+hours of my night trying to get this to work. Downloaded Google Chrome, unless there is a fix for FF (which I would prefer to use), i will have to switch to Chrome.
I can't pinpoint when this trouble started, but may have been after a recent Windows Update. I already did a System Restore to a restore point about 5 days ago (the oldest one available to me, and I believe that was before the FF trouble started). This has not helped either.
I have run a full virus scan with Kaspersky and a Full scan with Windows Defender. Nothing came up.
Anyone else been able to find a solution to this?
== This happened ==
Every time Firefox opened
== Less than a week ago ==
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.86 Safari/533.4

I found a way to make it work somehow but not really fixing the error... one day when I got really pissed off because FF just won't open, I clicked the icon and killed the enter button, then multiple FF windows appeared. I tried to open it with just a single hit of the enter or double clicking but it won't work anymore, but repeatedly clicking the enter button (mine works with just 3 hits, sometimes 6) seem to open it. And until now, I have no technical explanation for this.

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When I start Firefox for the first time, 1 Firefox.exe shows up in the Task Manager (8,180K), but Firefox doesn't start. When I click on it again, a second Firefox.exe shows in the Task Manager, and Firefox opens. Is the first one a Trojan?

I'm using version 3.6.12 on Windows XP. The icon points to C:\Program Files\Mozilla Firefox\Firefox.exe. The Properties of that file look okay.

No, most likely not. I reckon you got some antivirus software on your machine, don't you?
Sometimes Firefox does load into memory but won't show your start page.
Simply open the task manager, click on the "Processes" tab and kill the (two or more) firefox.exe processes you've just created. Double-click your Firefox icon and everything should be back to normal.

Firefox 3.6.13 opens in Windows 7-32bit, but I can see it only in Task Manager - no window at all.

My Firefox 3.6.13 was working fine, till 2 days ago. From Wednesday, it opens but I can see no window. I check with the Task Manager of Windows 7-32bit and I find it is ''open''. I've lost all my bookmarks and passwords and I have to spend a lot of time to put everything together in a... new browser.
I don't have a crash report, as Firefox is not crashing - it's just invisible. I checked my laptop for malware and viruses (with Bitdefender and Malwarebytes' Anti-Malware) and it's clean.
I totally uninstalled Firefox and I installed it again with a new clean profile, but exactly the same happens.
Please, help!
Thank you.
Sokratis.

It's possible that you are having a problem with some Firefox add-on that is hindering your Firefox's normal behavior. Have you tried disabling all add-ons (just to check), to see if Firefox goes back to normal?
Whenever you have a problem with Firefox, whatever it is, you should make sure it's not caused by one (or more than one) of your installed add-ons, be it an extension, a theme or a plugin. To do that easily and cleanly, run Firefox in [http://support.mozilla.com/en-US/kb/Safe+Mode safe mode] (don't forget to select ''Disable all add-ons'' when you start safe mode). If the problem disappears, you know it's from an add-on. Disable them all in normal mode, and enable them one at a time until you find the source of the problem. See [http://support.mozilla.com/en-US/kb/Troubleshooting+extensions+and+themes this article] for information about troubleshooting extensions and themes and [https://support.mozilla.com/en-US/kb/Troubleshooting+plugins this one] for plugins.
If you need support for one of your add-ons, you'll have to contact its author.
If the problem does not disappear when all add-ons are disabled, please tell me, so we can work from there. Please have no fear of following my instructions to the line, as all can be easily undone.

Why does firefox freeze and then doesn't fully release from memory, but I have to End Process from Task Manager?

Frequently, Firefox for Windows (Vista) freezes up. I click on a link or try to go to another web page and nothing happens. The icon in the tab is just spinning, with Connecting. but it never connects. Then when I close it - if it lets me. I click to open it again and a window pops up saying that Firefox is already running, to please close it before launching it again. I have to go to Task Manager and End task from the Processes tab. It is also a resource hog including the Plug-In Container.

The pluging container opens up unnecessary copies as the cookies/history are cleared, this is a known issue, it might be what you are seeing, and it is hoped to be fixed in some future release of firerox.
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Restarting, reinstalling doesn't fix.

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When I exit firefox it closes the program but it gets stuck in memory so when I open it again i have to kill the process in task manager

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== This happened ==
Every time Firefox opened
== a week or so a go ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; AntivirXP08; InfoPath.2; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)

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'''Kill Application'''
In Task Manager, does firefox.exe show in the '''Processes''' tab?
See: [http://kb.mozillazine.org/Kill_application Kill Application]
'''Causes and solutions for Firefox hanging at exit:'''
[[Firefox hangs]]
[http://kb.mozillazine.org/Firefox_hangs#Hang_at_exit Firefox hangs at exit]
[[Firefox is already running but is not responding]]
'''Safe Mode'''
You may need to use '''[[Safe Mode]]''' (click on "Safe Mode" and read) to localize the problem. 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.
See:
'''[[Troubleshooting extensions and themes]]'''
'''[[Troubleshooting plugins]]'''
'''[[Basic Troubleshooting]]'''
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.

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Firefox won't start, profile manager won't start, but firefox.exe shows in processes list (task manager)

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