Upon opening Firefox, I get this error message: Error: TypeError: xulItems[item].getAttribute is not a function

What is causing this? And how can I fix it?

After I started in safe mode and reset the toolbars, it got fixed! I am not getting the error message anymore. Thanks much.

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Suddenly every time I try to open firefox, I get this error: TypeError: Components.classes[cid_siterank] is undefined

it will load after I x it out, but when I open hotmail, it loads, and reloads, and acts as though it has a virus. in the address bar a message keeps flashing saying something about javascript. I've tried everything.

cor-el is correct. I confirmed this myself. Has nothing to do with Add-ons. It happened on a brand new laptop with no add-ons installed.
It is a bug that needs to be squashed ASAP.

After I downloaded Firefox 4 and I try to open Firefox, I get this error message, "plug-in object: TypeError: Components.classes[cid] is undefined". I click "OK"; Firefox opens and works just fine. Any suggestions??

Not much to add. Before Firefox will open, I get this error message, "plug-in object: TypeError: Components.classes[cid] is undefined". I click the "OK" button; Firefox opens and I have no further problems.
I use an Apple with OS v. 10.6.7 and had no problems until I downloaded Firefox 4.0

That indicates you have an add-on that is not compatible with Firefox 4. For details of how to troubleshoot that see https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

When I open Firefox I get this error-firefox.exe application error the instruction at 0x02c38690 referenced memory at 0x02c38690 the memory could not be written

When I open Firefox I get the following error: firefox.exe application error - The instruction at 0x02c38690 referenced memory at 0x02c38690 - The memory could not be written - Click on OK to terminate the program.
If you click on OK it closes Firefox - You can not reopen Firefox until you reboot the computer. Then it starts all over again.
The same happens if I click the "X" instead on the error window.

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
Did this fix your problems? Please report back to us!

Everytime I open firefox I get this "error message: xulItems[item].getAttribute is not a function", what is it why is it happening and how do I get it to stop?

This only happen when I 1st open Firefox. Nothing else is wrong and I don't think it messes with any of the functionality. It is primarily annoying.

Hello,
'''Try Firefox Safe Mode''' to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.
''(If you're not using it, switch to the Default theme.)''
* You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut.
* Or open the Help menu and click on the '''Restart with Add-ons Disabled...''' menu item while Firefox is running.
''Once you get the pop-up, just select "'Start in Safe Mode"''
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshooting extensions and themes]] article for that.
''To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
''When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.''
Thank you.

When I try and launch Firefox, I get this error message A copy of Firefox is already open. Only one copy of Firefox can be open at a time." and have tried all of the trouble shooting tips, can you help?

When I try and launch Firefox, I get this error message >A copy of Firefox is already open. Only one copy of Firefox can be open at a time." and have tried all of the trouble shooting tips, can you help? I thought if I were to completely uninstall and re install it might help, but I cannot seem to find instructions to do this....

See [[Firefox is already running but is not responding]], the image shown in that article is the Windows equivalent of the error message that you are receiving, but the information relates to the Mac.

I get this error message when opening Firefox "onload error TypeError: TcFfUpdates.getTcPluginsInstance().getNewExtensionsList is not a function"

Each time I open Firefox I get the error message. I have unistalled the product, re-downloaded it and installed it with the same results. Otherwise the browser seems to work well.

Start Firefox in [[Safe Mode]] to check if one of the extensions 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.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

I have tried uninstalling and reinstalling Firefox several times. Every time I try to open Firefox I get an error message saying "Close Firefox"," A copy of Firefox is already open. Only one copy of Firefox can be open at a time."

I uninstall Firefox, then reinstall Firefox, try to open Firefox, and get an error message in a popup box saying,
"Close Firefox"
"A copy of Firefox is already open. Only one copy of Firefox can be open at a time."

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.com/kb/Basic+Troubleshooting#w_8-make-a-new-profile
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

When I try to open iTunes, I get this error message: Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item. I get a different error message if I try to uninstall it.

When I try to open iTunes, I get this error message: "Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item." I've been able to uninstall all Apple products except iTunes as I get this error message: "The Installer has insufficent privileges to modify this file: C:\Program Files\i Tunes\Acknowledgments.rtf." I've had the iTunes on my laptop for a year and a half with no problems until now.

Any suggestions please?

When i open itunes it get this error message (-42110) just did an update and it still didn't go away????

hen i open itunes it get this error message (-42110) just did an update and it still didn't go away????

Try the following user tip:
iTunes for Windows 11.0.2.25 and 11.0.2.26: "Unknown error -42110" messages when launching iTunes

I get this message everytime I open Firefox: "[JavaScript Application]" and the message is: "TypeError: test is undefined."

I get this message everytime I open Firefox: "[JavaScript Application]" and the message is: "TypeError: test is undefined."

This issue can be caused by an extension that isn't working properly.
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
Start Firefox in [[Safe Mode|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

When I try to open Firefox, I get an error message that begins "The procedure entry point ?CreateDrawTargetForCairoSurface@Factory...could not be located..."

When I try to open Firefox, I get an error message that reads "The procedure entry point ?CreateDrawTargetForCairoSurface@Factory@gfx@mozilla@@SA?AV?$TemporaryRef@VDrawTarget@gfx@mozilla@@@3@PAU_cairo_surface@@ABUIntSize@23@@Z could not be located in the dynamic link library gkmedias.dll.
My only option is to click okay in the Error Message Box, but Firefox will not open then.

Do a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.
*(32 bit Windows) C:\Program Files\Mozilla Firefox\
*(64 bit Windows) C:\Program Files (x86)\Mozilla Firefox\
*http://kb.mozillazine.org/Installation_directory
Download a fresh Firefox copy and save the file to the desktop.
*Firefox 17.0.x: http://www.mozilla.org/en-US/firefox/all.html
Uninstall your current Firefox version, if possible, to cleanup the Windows registry and settings in security software.
*Do NOT remove personal data when you uninstall your current Firefox version, because all profile folders will be removed and you will also lose your personal data like bookmarks and passwords from profiles of other Firefox versions.
Remove the Firefox program folder before installing that newly downloaded 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.
*http://kb.mozillazine.org/Uninstalling_Firefox
Your bookmarks and other profile data are stored in the Firefox Profile Folder and won't be affected by an uninstall and (re)install, but make sure that "remove personal data" is NOT selected when you uninstall Firefox.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall
Try to disable hardware acceleration in Firefox.
*Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
*https://hacks.mozilla.org/2010/09/hardware-acceleration/

When I try to open Itunes I get this error msg, 'This copy of iTunes is corrupted or is not installed correctly. Please re install iTunes (-42404), I have tried repairing

When I try to open Itunes I get this error msg, 'This copy of iTunes is corrupted or is not installed correctly. Please re install iTunes (-42404), I have tried repairing, no joy, uninstalling and re installing, no joy. Any ideas?
<Subject Edited by Host>

For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
tt2

TS1717 Can't open iTunes, keeps getting this error "iTunes.exe - Unable to locate component. This application has failed to start because MSVCR80,dll was not found"

Can't open iTunes, keeps getting this error "iTunes.exe - Unable to locate component. This application has failed to start because MSVCR80,dll was not found"

Solving MSVCR80 issue and Windows iTunes install issues.

When I open Firefox it gives this error, ReferenceError: mtRpt is not defined, and then open normally. How do I fix it?

When I open Firefox it gives this error, ReferenceError: mtRpt is not defined, and then open normally. How do I fix it?

This issue can be caused by an extension that isn't working properly.
Start Firefox in [[Safe Mode]] to check if one of the extensions 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.com/kb/Safe+Mode
* [[Troubleshooting extensions and themes]]
In Firefox 4 you can use one of these to start in [[Safe mode]]:
* Help > Restart with Add-ons Disabled
* Hold down the Shift key while double clicking the Firefox desktop shortcut (Windows)

Upon opening Firefox, I get this error message: Error: TypeError: xulItems[item].getAttribute is not a function

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