Firefox will not open because of this error message...[JavaScript Application] Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]

when this error box opens the only way to close it is to shut the firefox process

Some how I solved my problem by opening a user account and downloading Firefox 4.0 beta and installing it, I did try it, worked fine, so I did close the user account and did go back to my own account(switched user), the main page that I had problem with Firefox which would not open, I dabble click on Firefox it start working again!! I hope that solves your problem too.
firefox will not open, it gives me this cod and would not turn off, Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref] id: none

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Firefox will not open, it gives me this cod and would not turn off, Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref] id: none

I restored my computer to earlier time and I did an other restore but to latest time and since then every time I click on Firefox short cut this window comes up with the same cod and I can not turn it off unless turn off or restart my laptop, I did delete the Firefox few times and reinstalled it but did not change anything, still I get the same cod,
Error on switching in renew:
NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]
id: none

Some how I solved my problem by opening a user account and downloading Firefox 4.0 beta and installing it, I did try it, worked fine, so I did close the user account and did go back to my own account(switched user), the main page that I had problem with Firefox which would not open, I dabble click on Firefox it start working again!! I hope that solves your problem too.
firefox will not open, it gives me this cod and would not turn off, Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref] id: none

IMacros error= NS_ERROR_UNEXPECTED: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref], line 3 (Error code: -1001)

I use Imacros. I got this error NS_ERROR_UNEXPECTED: Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref], line 3 (Error code: -1001). I think it is because of this version of mozilla firefox 28.0. I read I should downgrade the version to 27, but I have read it is not safety. Will the problem will be resolve? if not I think I should take the risk...

hello abmporras, please report the issue to the developer's of the addon through the support channels listed at https://addons.mozilla.org/firefox/addon/imacros-for-firefox/. they should be able to address the issue better.

Error in getValue: [Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getComplexValue]" nsresult: "0x8000ffff (NS_

This error keeps popping up every couple of minutes.
Error in getValue: [Exception... "Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getComplexValue]" nsresult: "0x8000ffff (NS_ERROR_UNEXPECTED)" location: "JS frame :: chrome://socialfixer/content/prefman.js :: <TOP_LEVEL> :: line 18" data: no]

Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do NOT click the Reset button on the Safe Mode start window.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

Error: Javascript Application: what happened:[Exception... "Component returned failure code: 0x80520012 (NS_ERROR_FILE_NOT_FOUND) [nsIFile.createUnique]" nsresult: "0x80520012 (NS_ERROR_FILE_NOT_FOUND)" location: "

When I double click on the Firefox icon, a box pops up heading Javascript Application and inside is the error message as detailed above. The box offers only one option "OK" and once I click on that the program works well. I access emails online and when I click on the respons button or to send a new email, the same error message pops up.

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]]

Firefox will not open, a pop up window message says: The application or dll mozilla firefox xul.dll is not a valid windows image. I am using XP and firefox use to work perfectly

Firefox will not open a pop up window says "the application or dll c:program files mozilla firefox xul. dll is not a valid windows range"
== This happened ==
Every time Firefox opened
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB0.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)

I resolved the problem. I went to CNet and re-downloaded the upgrade. It proceeded as intended and the upgrade is installed and running with no loss of plug-ins, bookmarks, etc.

When I try to start Firefox I get an Error Message: (Javascript /application) Error on adding toolbar element. TypeError, aButtonLabel is undefined. id. Google Shortcut settings

When I try to start Firefox I get an Error Message: (Javascript /application) Error on adding toolbar element. TypeError, aButtonLabel is undefined. id. Google Shortcut settings. Firefox will not start. I have been through the troubleshooting steps. Nothing helps
== I tried to enter Firefox. No apparant reason ==
== 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; InfoPath.2; AskTbGLSV5/5.8.0.12304)

Hi,
had this problem but now sorted.
Go to settings for google shortcuts, follow link to homepage and upload latest version, it has not yet been approved by Firefox, but works and solves the bug.
Hope this helps.
A

Firefox will not open because of a "nssutil3.dll" error. How can I back up my bookmarks when Firefox will not open?

Firefox would not open because of a "nssutil3.dll " problem. I've researched the problem, and I am using Norton 360 which is not a known antivirus program that deletes the file as a trojan. I want to uninstall and reinstall firefox, but first I want to make sure my book marks are safe.
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; GTB6.5; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.30729; .NET CLR 3.0.30618; Tablet PC 2.0)

See this:
[http://support.mozilla.com/en-US/kb/Backing+up+your+information]

Firefox will not open, try to reinstall and message states firefox must be closed before install can begin.

firefox will not open. when i try to reinstall firefox the process stops. the message tells me to close firefox before i can proceed. but firefox is not running.

Prez,
I too have had this problem a few times with several different versions of FF.
What you need to do is to open a window to Task Manager (Ctrl-Alt-Del) and on the 'Processes' tab look down the list for Firefox, highlight the entry, then click "End Process". Accept the warning that pops up. You should then be able to uninstall.

Firefox will not open because "error:platform version 1.9.2.13 is not compatable with min version =1.9.2.12 or maxVersion =1.9.2.12 " is in a window when I open Firefox

It started a year ago when I opened Firefox I got an error message, so I removed firefox & re-installed it. Still no go! So I opened "C" drive & searched for anything "firefox" & found a 2002 version!! I deleted everything, restart, & installed firefox and what I get now is what you see above.
OS is XPpro, sp3 + many updates.

Do a clean (re)install:
* Download a fresh Firefox copy and save the file to the desktop.
* http://www.mozilla.com/firefox/all.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Don't remove personal data if you uninstall the current version.
* 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.
Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

Firefox will not open because it thinks it is open, but task manager says it is not open.

I cannot get firefox to open. If I try to uninstall it says I must close it. If I try to download it it says I must close it.

Sounds like Firefox is "hanging at exit". That problem is frequently caused by an Extension or a Plugin. Read all of the following articles. 
NOTE: Establish a habit of exiting/closing Firefox with Firefox button > Exit or File > Exit to allow an orderly shutdown of Firefox and closing of all of the files that Firefox has open.
#Stop the Firefox process:
#*[http://kb.mozillazine.org/Kill_application Mozillazine - Kill application]
#*Windows 7 users click [http://www.techrepublic.com/blog/window-on-windows/reap-the-benefits-of-windows-7s-task-manager/2576 here]
#*Mac users: http://techheavy.com/2011/02/the-mac-task-manager/
#Why Firefox may hang:
#*[http://support.mozilla.org/en-US/kb/Firefox+hangs Firefox hangs] (see Hang at exit)
#*[http://kb.mozillazine.org/Firefox_hangs Firefox hangs (Mozillazine)] (see Hang at exit and Closing Firefox properly)
#*[https://support.mozilla.org/en-US/kb/Firefox+is+already+running+but+is+not+responding Firefox is already running but is not responding]
#Use Firefox Safe Mode to find a problem with an Extension or Plugin:
#*Don't check anything when entering Safe Mode, just continue
#*If the problem does not occur in Safe Mode it is probably an Extension or Plugin causing the problem
#*See:
#**[[Safe Mode]] and [http://kb.mozillazine.org/Safe_Mode Safe Mode (Mozillazine)]
#**[http://support.mozilla.org/en-US/kb/Troubleshooting+extensions+and+themes Troubleshooting extensions and themes]
#**[http://support.mozilla.org/en-US/kb/Troubleshooting+plugins Troubleshooting plugins]
#**[http://support.mozilla.org/en-US/kb/Basic+Troubleshooting Basic Troubleshooting]
'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

Constantly getting the following error message JavaScript Application error: "An error has occurred: error"

I about to give up on using Firefox since I've tried everything I know: cleared cache & reinstalled Firefox

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
Create a new profile as a test to check if your current profile is causing the problems.
See "Basic Troubleshooting: Make a new profile":
*https://support.mozilla.org/kb/Basic+Troubleshooting#w_8-make-a-new-profile
There may be extensions and plugins installed by default in a new profile, so check that in "Tools > Add-ons > Extensions & Plugins" in case there are still problems.
If that new profile works then you can transfer some files from the old profile to that new profile, but be careful not to copy corrupted files.
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Following recent Firefox update, I keep getting the foillowing Java message -Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIWindowsRegKey.op

Following recent Firefox update, I keep getting the following Java message each time I attempt to download a file, - Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIWindowsRegKey.op.
Following a click on the off cross, it then allows the download to continue.
When is AFG Safe Search to be fixed?

please report this error to AVG, the 3rd party developer of the addon, in order for them to fix it...

Since the latest update, when I open Firefox , I get an "Exception..."Component returned failure code: 0x80004005....skype..ff_extension/content/browser Overlay.js

Within the past few days when there was a Firefox update, every time I start Firefox, I get the following message (shortened in the middle): Exception..."Component returned failure code: 0x80004005...skype_ff.extension/content/browser Overlay.js"
When I clicked on a link on the US Bank website, I received [Exception... "Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [ISkypeFfExtension.Initialize]" nsresult: "0x80004005 (NS_ERROR_FAILURE)" location: "JS frame :: chrome://skype_ff_extension/content/browserOverlay.js :: <TOP_LEVEL> :: line 9" data: no]
In both cases, if I click OK, the process I requested then takes place. What do I need to do?

If you're having this issue open Firefox, go to Tools on the Firefox tabs at the top of your browser window, and click on Add-ons. This will take you to your Add-ons page. Click on Extensions on the right side of the screen and scroll down to the Skype extension add-on. Click on "Disable" to disable this extension. Once this extension is disabled your problem should be fixed. In my case it repaired the problem.

Firefox will not open unless I run it in compatibility mode (Windows XP SP 3), run it as an administrator, or launch it immediately after a reinstall (the reinstall thing only works once.) How do I fix this?

This morning, Firefox crashed. After this, when I click the Firefox icon, the hourglass appears and then nothing happens. Firefox does briefly appear in the task manager when I do this.
I tried rebooting. I tried reinstalling multiple times. (Firefox will run when I select "Launch Firefox" from the installer. Then the problem occurs again.) I tried safe mode. I have found that Firefox will work if I select Windows XP compatibility mode from the icon properties menu or if I run the program as an administrator. When I do this, Windows asks me if I want a program to be able to make changes to my computer.
I have noticed that a Windows Error Report is being generated each time Firefox will not open.

A possible cause is security software (firewall,anti-virus) 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 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 internet 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

Firefox will not open because of this error message...[JavaScript Application] Error on switching in renew: NS_ERROR_UNEXPECTED, Component returned failure code: 0x8000ffff (NS_ERROR_UNEXPECTED) [nsIPrefBranch.getCharPref]

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