Firefox.exe is an unregistered application in Windows XP. What's up?

I am using a "registry cleaner" which reports that the .pdf file type association references an unregistered application "firefox.exe"
Should I tell the cleaner to "delete this erroneous value" or is it not a problem?

Thanks for the suggestion, Guys, but neither provided the solution. I'd already updated both BIOS and Chipset drivers to the latest available.
Incidentally, the OS is the version of XP that came already loaded - subsequently updated via Windows Update, of course.
Any further thoughts anyone??
Bob

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Error message: Windows\prefetch\Firefox.exe-06188867.pf is corrupted and unusable. What do I do ?

The error message suggests that I run 'chkdsk' utility, but something prevents this from runnning. I tried re-installing Firefox, but did not uninstall first. Is this the best approach ? AND .. Most important .. If uninstall, and re-install, Will I lose my bookmarks ?

Hello rickcanham, it is not important because it is a [http://en.wikipedia.org/wiki/Prefetcher prefetch file], go from START > Run > type '''prefetch''' and delete the file (and if you want any file in the prefetch folder, actually do it from time to time it is where windows prefetches data when the system starts), then try to restart firefox.
If you select to unistall firefox do not select to remove your personal data, your profile data is stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder], so you won't lose your bookmarks or other personal data.
thank you

We cannot get firefox installed on our new laptop with windows 8, what do we need to do?

I have a Windows 8.1 platform on a new computer. When we try to download firefox the button comes up to push run. After that Norton scans and states that it is safe but a new program with very few people using it. I click on the spot saying that it is safe, and it goes away, but the program doesn't run. I've also tried to download it and then run. it will download but when I try to run it Norton comes up and the same thing as above happens.
I've also tried turning off Norton for 1 hour and tried the same 2 things as above with the same results.

In case Norton is objecting to the "stub" installer (the download has the word "stub" in the name) try using the full installer. You can download it from the following page, just scroll down to your preferred language:
https://www.mozilla.org/firefox/all/
Does that one work?

Everytime I use firefox to connect to the internet I get an alert saying that firefox could not initialize the applications security component. What does this mean and how do I fix it?

When I use firefox to get on to the web I get the following message everytime: "Alert: Could not initialize the applications security component. The most likely cause is problems with files in your applications pforfile directory. Please check that this directory has no read/write restrictions and your hard disk is not full or close to full. It is recommended that you exit the application and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security feactures." Once I click the "OK button" at the bottom of the alert box firefox starts but does not act right. For instance it will not let me look for software updates. When I click on "Check for Updates" from the "Help" drop down menu I get a message stating: "There were problems checking for, downloading, or installing this update. Firefox could not be updated because: Update XML file malformed (200). You can update firefox manually by visiting this link and downloading the latest version."

The following support articles should help:
* https://support.mozilla.com/kb/Could+not+initialize+the+browser+security+component
* https://support.mozilla.com/kb/AUS+Update+XML+File+Malformed+200

I am trying to launch Firefox 9.0.1 on Windows 7 but the application window isnt visible even though there is a firefox.exe process running in task manager.

I am trying to launch Firefox 9.0.1 on Windows 7 but it isnt working. I try to launch it and the application window does not show. When I look at the task manager and then look at the Applications tab, Firefox isnt listed. If I go to the Processes tab, there is a firefox.exe*32 process listed. Each time I double click the Firefox icon, a new firefox.exe process is spawned but there is never a visible instance of the Firefox application.
There are no errors in the application logs. I end up just having to kill the processes.
I tried launching in safe mode by holding down the shift button but the same thing happens.
Any suggestions on what to try? It has never worked since upgrading from version 8. I tried un-installing and re-installing

I went through everything mentioned in the link you posed and nothing detailed there resolved the problem.
The Profile folder didnt exist so I created it. Made sure the perms were good and that it was not read only.
There are no default folders appearing under the profile folder when I start Firefox.
I have Firefox installed to my E drive.
Nothing happens. The process appears in the task manager but no application shows up.
Cant start it in safe mode, cant run the profile manager.

Description: A problem caused this program to stop interacting with Windows. Problem signature: Problem Event Name: AppHangB1 Application Name: firefox.exe Application Version: 1.9.2.3855 Application Timestamp: 4c48d5ce Hang Signature: 9962

I am having this problem, in the first window when I try to do anything.
Description:
A problem caused this program to stop interacting with Windows.
Problem signature:
Problem Event Name: AppHangB1
Application Name: firefox.exe
Application Version: 1.9.2.3855
Application Timestamp: 4c48d5ce
Hang Signature: 9962
Hang Type: 0
OS Version: 6.0.6002.2.2.0.768.3
Locale ID: 1033
Additional Hang Signature 1: 5df72ce88195c0212c542e9c8c172716
Additional Hang Signature 2: 2b94
Additional Hang Signature 3: 9acafbb8ad01bf9d2eb258d8fddad3ca
Additional Hang Signature 4: 9962
Additional Hang Signature 5: 5df72ce88195c0212c542e9c8c172716
Additional Hang Signature 6: 2b94
Additional Hang Signature 7: 9acafbb8ad01bf9d2eb258d8fddad3ca
== This happened ==
Every time Firefox opened
== User Agent ==
Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4

I suspect a RAM or hardware problem.

Firefox 4 does not start but I can see Firefox.exe in Windows Task Manager, nothing in Applications

I am on Window 7/32bits machine. When I start Firefox 4 nothing loads. I looked into Windows Task Manager, I can firefox.exe in the processes but nothing in Applications.
Here are few things I have tried but didn't work for me.
- Restarted Computer and tried to open Firefox, waited for half an hour nothing happens.
- did 'End Process' in Windows Task Manager, Processes and tried in again
- reinstalled into different folder and tried to run from there, still the result is same.
Is there anything else I can try to resolve this issue.

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.
See:
* https://support.mozilla.com/kb/Server+not+found
* https://support.mozilla.com/kb/Firewalls

NsAppShell:Event Window: firefox.exe- Application Error

Since downloading Ff4 when closing the program I receive this error message;
nsAppShell:Event Window: firefox.exe- Application Error
The instruction a "0x77f87f6d" referenced memory at "0x7c59c44a". The memory could not be "written".
Click OK to terminate the program.
How can I resolve this issue? I am on an older OS (2000 pro) with 2Gigs memory and P-4 processor (if this information helps).

Your System Details
Installed Plug-ins
Shockwave Flash 14.0 r0
Shockwave Flash 12.0 r0
Shockwave Flash 11.9 r900
Having more than one version of a program may cause issues.

What does firefox.exe-application error mean? Firefox wont even open it just says this, and then click okay to terminate the problem.

When I go to open up Firefox, it does not open no matter what I try It just pops up this box that says Firefox.exe - application error.
Then it says the Instruction at "0x798377a9" referenced memory at "0x798377a9". The memory could not be "written".
Click on OK to termintate the program
What does this mean? And why cant I use Firefox. I can still use internet explorer just fine.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; InfoPath.1)

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.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Firefox will not start and I get firefox.exe Application Error with the code 0x00000000, I've tried reloading but always get the same error message!

Firefox will not start, I've tried opening in safe mode, no joy. I get the firefox.exe application error 0x00000000
== This happened ==
Every time Firefox opened
== Possibly after a windows update ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; .NET CLR 1.1.4322; InfoPath.1)

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.
See http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Why on close am I geting " firefox.exe -Application error - The memory could not be "written" "?

Why on close am I geting " firefox.exe -Application error "The instruction at "0x00000000" reference menory at "0x00000000". The memory could not be "written" Click OK to terminate."?
This is on Window XP
A program White Smoke was loaded into this unit about 3 month ago and a popup to buy started appearing 1 week ago. I unistalled the program and i found virus that was removed.
The unit will not allow a system restore also.

You do not need to start Firefox to disable the Java Quick Starter, you can do that via the Java Control Panel (Control Panel > Java > Advanced)
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]]

I can't open firefox. These are the problem details. Problem Event Name: APPCRASH Application Name: firefox.exe Application Version: 23.0.1.4974 Appli

Problem Event Name: APPCRASH
Application Name: firefox.exe
Application Version: 23.0.1.4974
Application Timestamp: 520bc252
Fault Module Name: ntdll.dll
Fault Module Version: 6.0.6002.18881
Fault Module Timestamp: 51da3e27
Exception Code: c0000005
Exception Offset: 00066448
OS Version: 6.0.6002.2.2.0.768.3
Locale ID: 2057
Additional Information 1: bfef
Additional Information 2: e8adce1c2b9e7be834b4063ac3c53863
Additional Information 3: bfef
Additional Information 4: e8adce1c2b9e7be834b4063ac3c53863
Read our privacy statement:
http://go.microsoft.com/fwlink/?linkid=50163&clcid=0x0409

Try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
If it works in Safe Mode and in normal mode with all extensions (Firefox/Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.
Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: Firefox > Quit Firefox; Linux: Firefox/File > Quit)
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration

Firefox.exe +application error +the application failed to initialize properly (0x0150004) +click on OK to terminate the application.

Win XP Home SP2
Installed Firefox, but receive the following error message:
firefox.exe +application error +the application failed to initialize properly (0x0150004) +click on OK to terminate the application.
Have uninstalled and reinstalled several times, but same message. Firefox won't even open.

Usually someone has been down the track before and occasionally they post some useful details which may help others to investigate and/or eliminate factors in their particular case.
This AccessibleMarshal.dll error seems to have a long history --- posts from 2006 with early Firefox versions had issues similar to yours.
There is a link and an excerpt below which could be worth checking in your case,
particularly since it mentions the problem would occur on a clean install (no previous instance of Firefox on the system and Windows before Vista --??)
Have a look here:
https://bugzilla.mozilla.org/show_bug.cgi?id=712960
and the post to read:
'''Mark Banner (:standard8) 2011-12-22 12:55:21 PST'''
"Created attachment 583905 [details] [diff] [review]
Add the Win32 redistributable directory to the mozconfigs"
"Somehow we missed shipping the Win32 Redistributables from Visual C++. We didn't detect this as it would only show on Windows versions less than Vista, and you'd probably only see it if you had a completely clean install, and you didn't have the dlls installed elsewhere (as it appears my XP system does)."
"If you're seeing this then you want to copy the following files from a Firefox installation:
Microsoft.VC80.CRT.manifest
msvcm80.dll
msvcp80.dll
msvcr80.dll
The patch I'm attaching updates our configuration files to specify the Win32 redistribution directory, which will then cause the build system to include the files in the build."
.... ends....
The earlier 2006 instances also had the same issue in some cases:
forums.frontmotion.com/viewtopic.php?f=10&t=393
Hope this progresses the search and resolution.
Cheers

Firefox window will not open - firefox.exe closes by itself

Hello,
I have a problem with Firefox not being able to start when I double-click the icon on my desktop. I'm not sure what version I was using before, but I uninstalled whatever version I had before and installed the latest version (14.0.1), with no effect.
I can see that when I try to open Firefox, the firefox.exe process will stay open for about five seconds, then disappear. I've tried to open Firefox in Safe Mode and open the Profile Manager via the command line, but the window never opens, the process always appears for a few seconds and disappears on its own.
Anybody know what is causing this or how it can be fixed?

Hey, thanks for all the help so far. Sorry for the late response.
I followed your instructions, even getting rid of my bookmarks and personal data when uninstalling, and here's what happened:
After installing, I kept "Launch Firefox" checked at the last prompt. A window opened, it asked me whether I wanted to import anything from other browsers, I said no. Then it opened the regular Firefox browser window! But, I closed it and re-opened Firefox just to make sure it would still work...then it did the same thing it was doing before, opened for a few seconds and then closed on its own without opening the window. :-( So, it would open only once, the initial time and then that's it.
I don't get a crash reporter at all. No visual confirmation that Firefox is trying to open, except the process appearing a few seconds in the Task Manager and disappearing.
My antivirus program is AVG Anti-Virus Free Edition 2012. I do virus scans with Malwarebytes Anti-Malware occasionally. I don't have Windows Firewall turned on right now because it caused problems with another application.
This problem is particularly pesky...I don't know what happened, until a couple of days ago Firefox was running fine...
Any further help or suggestions would be appreciated!

Getting Firefox.exe Application Error on closing firefox

Locking duplicate thread. Please continue here: [[/questions/1002236]]
Hi I have Firefox Browser 29.0.1 and on Windows XP - and I am the least tech savvy person ever. Every time I close The Browser / Firefox I get a pop-up screen Firefox.exe - Application Error
The instruction at "0x0301230e" referenced memory at "0x00000004", The memory could not be "read" click on OK to terminate the program. It dosen't appear to be affecting the operation of anything, but is annoying, regardless of whether I click OK or just close the box with "X" nothing happens - but I'd like to get rid of this, if possible

Hello,
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 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).
#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 [https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems?esab=a&s=troubleshooting&r=3&as=s#w_5-reinstall-firefox here].
WARNING: Do not run Firefox's uninstaller or use a third party remover as part of this process, because that could permanently delete your Firefox data, including but not limited to, extensions, cache, cookies, bookmarks, personal settings and saved passwords. These cannot be recovered unless they have been backed up to an external device!
Please report back to see if this helped you!
Thank you.

Firefox.exe is an unregistered application in Windows XP. What's up?

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