When I try to open FireFox it says I am missing nspr4.dll and mozqlite3.dll. How do I fix this?

I downloaded FireFox 8.0 not too long ago, and when I launched it, it said nspr4.dll and mozqlite3.dll were not found on my computer. I've used FireFox for a long time, and this has never happened before.

Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 8.0.x: http://www.mozilla.com/en-US/firefox/all.html
Uninstall your current Firefox version if possible.
*Do not remove personal data when you uninstall the current version or you lose your bookmarks and other data in the profile folder.
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.
Your bookmarks and other profile data are stored elsewhere in the Firefox Profile 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.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*http://kb.mozillazine.org/Profile_backup

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I get the following message when I try to open firefox 5: TypeError: Components.classes[cid] is undefined. Is there a way to fix this?

as above

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
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

Error when I try to open Firefox. Says Firefox is running in the background and cannot open. Suggests closing that window or restart system. This has happened several times recently. I reinstalled but am still getting the error. Any thoughts?

I am getting an Error when I try to open Firefox that Says Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system. This has happened several times recently. I deinstalld and reinstalled but am still getting the error. Any thoughts?

This happens to me as well. However, I have a shortcut on my desktop as well as my quick start bar. When this has happened to me, I can usually log back in without restarting, by using the shortcut on the desktop rather than the usual quick start bar.
I know this sounds weird, but it has worked for me about 80% of the time.

I DOWNLOADED FIREFOX 10 ON MY WINDOWS 7 COMPUTER I REBOOTED AS TOLD BUT WHEN I TRY TO OPEN FIREFOX IT SAYS IT HAS TO BE REBOOTED; WHEN I TRY TO UNINSTALL IT SAYS IT HAS TO BE REBOOTED OVER AND OVER AGAIN in English

I DOWNLOADED FIREFOX 10 ON MY WINDOWS 7 COMPUTER I REBOOTED AS TOLD BUT WHEN I TRY TO OPEN FIREFOX IT SAYS IT HAS TO BE REBOOTED; WHEN I TRY TO UNINSTALL IT SAYS IT HAS TO BE REBOOTED OVER AND OVER AGAIN in English

Exactly what did you do to "try to transfer all of yoru photos" to the iMac?
LN

When I try to open Firefox, warning saying profile missing or inaccessible

When I try to open Firefox, a warning sign appears saying your firefox profile cannot be loaded. It may be missing or inaccessible

When I try to open Firefox, a warning sign appears saying your firefox profile cannot be loaded. It may be missing or inaccessible

Sometimes when I try to open firefox it says another application of firefox is already running and I have to close it first,isn't.

At least once a day I try to open Firefox and it won't let me. It says another application of Firefox is already running and I have to close it first. There is no other applicaion of Firefox running, and I have to reboot the computer.

See "Hang at exit":
*http://kb.mozillazine.org/Firefox_hangs
See "Firefox hangs when you quit it":
*https://support.mozilla.org/kb/Firefox+hangs

When I try to open firefox it says that it is not responding, after I disabled the adobe flash plug-in it worked, how do I get it to work with flash

Since I updated my adobe flash player firefox keeps saying that it is not responding after I open it and it loads my home page, I disabled add-ons and went throught the process of figuring out which one it was and it was adobe flash, but without flash I cant access a lot of different sites, how can I fix this. I have tried uninstalling and reinstalling both firefox and adobe flash, but neither works!

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

When I try to open Firefox, Google say the ULR does not exist on the website?

I use Firefox and have the latest version. Currently when I try and open Firefox, Google posts and error message saying the 404 the ULR does not exist on the web. What do I need to do? In layman's terms please.

Clear the cache and remove cookies only from websites that cause problems.
"Clear the Cache":
*Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox > Preferences > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
If you use a bookmark then try to navigate to that page starting with the home page of the website (main domain) in case the bookmark is no longer valid.

When I try to open firefox it says an update is ready to apply, but when I click ok it says it can not because firefox is already running.

When I double click Firefox it says an update is ready to be applied. Would you like to apply it now? I click yes and a green bar starts to fill, at about 3/4 it beeps twice it says it could not be completed because another instance of Firefox is already running, please close it and retry. However, the only program my task-manager shows is the update.

Did you check the Processes tab in the Task Manager? 
You may also have other (security) software that is having a file handle open on some of the files. 
In that case you may need to download the full version and delete the Firefox program folder before installing that downloaded update.
* Download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
* 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.
Your above posted system details show outdated plugin(s) with known security and stability risks that you should update.
*Shockwave Flash 10.0 r32
Update the [[Managing the Flash plugin|Flash]] plugin to the latest version.
*http://www.adobe.com/software/flash/about/

When I try to open Firefox, it says that "the proxy server is refusing connections." What settings do I need to change? Even though the internet signal is strong, I can't open any webpages.

It also says that Windows cannot connect to the Internet using HTTP, HTTPS or FTP. This is probably caused by Firewall settings on this computers. Check the firewall settings for HTTP port (80), HTPPS prot (443) & FTP port (21).
This all started when I tried to tried to delete the Verizon Broadband toolbar and home page that always opened when I opened Firefox.

In Firefox 3.6.4 and later the default connection settings have been changed to "Use the system proxy settings".
See "Firefox connection settings" in [[Server not found]]
You can find the connection settings in "Tools > Options > Advanced : Network : Connection" 
If you do not need to use a proxy to connect to internet then select No Proxy

When I try to open firefox, it says that a session is already running and I need to close it before I can run another session, I cannot find the session that's running, what can I do?

This happens after I have used firefox and exited the program. When I try to reuse the program I get this message. Is there a setting within firefox causing this or ??? I have tried to locate the session running without any luck. Would appreciate any help. I have uninstalled the program and then reinstalled it, but nothing has changed it continues to malfunction.

See "Hang at exit":
* http://kb.mozillazine.org/Firefox_hangs
* [[Firefox hangs]]

When I try to go to Yahoo from my bookmark bar I get redirected to Facebook, how do I fix this?

It's really as simple to explain as what the question asks. When I click on Yahoo, it takes me to Facebook instead, even though Yahoo is set as the destination for that bookmark. I'm only running Ad Block Plus as an add-on, but I don't see how it would affect this since it doesn't do this with any other bookmarks.

Your issue may be caused by Malware. You can run and update the following free anti virus software:
1. Malwarebytes (Free version) - http://www.malwarebytes.org
2. Spybot Search & Destroy - http://www.safer-networking.org
3.Spyware Terminator - http://www.spywareterminator.com
In addition, there are a number of forums you can use to help get rid of your infection. These include:
* http://www.bleepingcomputer.com/forums/
* http://forums.spybot.info/
* http://www.spywarewarrior.com/index.php
Make sure that you update each program to get the latest version of their databases before doing a scan.
* Malwarebytes' Anti-Malware:
http://www.malwarebytes.org/mbam.php
* AdwCleaner:
http://www.bleepingcomputer.com/download/adwcleaner/
http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware:
http://www.superantispyware.com/
*Microsoft Safety Scanner:
http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: Home Page:
http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
*Spybot Search & Destroy:
http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan:
http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller:
http://support.kaspersky.com/5350?el=88446
*[[Troubleshoot Firefox issues caused by malware]]

When I try to open Firefox, it says it is running in the Task manager, but will not open until the memory has reached about 100,000k. Also, it keeps NOT responding all the time, and freezes up.

I have done everything on the support page. I am running Windows Vista, and I am running Firefox 4.01. I have even tried running in safe mode. I have updated my plugins, and then disabled plugins and extensions.

Hello Pohaku66, any luck if you [https://support.mozilla.org/kb/firefox-already-running-not-responding#w_remove-the-profile-lock-file remove the profile lock file] ?
thank you

WHEN I TRY TO RUN FIREFOX IT SAYS AL;READY RUNNING IN BACKGROUND AND DOES NOT LOAD, HOW TO OVERCOME THIS ERROR

Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system.

See:
* [[Firefox is already running but is not responding]]
* http://kb.mozillazine.org/Profile_in_use

I just chose a 4 digit code for the lock on my phone and now when i try to open it is says it is the wrong code and has now locked me out of the phone for 30 minutes

how do i reset passcode to get into phone

you will have to have a computer with itunes to restore it to factory settings .. try to find an apple store near you

When I try to open FireFox it says I am missing nspr4.dll and mozqlite3.dll. How do I fix this?

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