Firefox will not start--a series of problems.

I hope someone can help me. This is a long one.
I've had a number of problems with Firefox since installing it several weeks ago. It worked fine for a while, but one day upon trying to open Firefox I received this message: Alert. Could not initialize the application's security component. The most likely cause is problems in your application's profile 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 program and fix the problem. If you continue to use this session, you might see incorrect application behaviour when accessing security features."
The only thing it really affected was that I couldn't access Facebook, but I tried to trash Firefox so I could reinstall. When I attempted to empty the trash, I received the following message: "The operation cannot be completed because the item "libsmime3.dylib" is in use."
I restarted my Mac and found my trash was empty and Firefox wasn't on my machine anymore. Subsequent attempts to install Firefox, however, just cycle through the same problem. Now when I try to open Firefox after installing, I get the message "A copy of Firefox is already open. Only one copy of Firefox can be open at a time."
I've searched for possible cures and as far as I can tell I have to delete the Firefox profile. I've tried to find it, downloaded Onyx to look for invisible files, but no dice. I'm getting very frustrated but I specifically need to use Firefox for a program in which I will be participating in a couple weeks. Unfortunately my software won't work with Safari. I have been troubleshooting this myself but I can't make any progress with the problem.

Same Same but Same. Deleted all Firefox and Mozilla directories under both system library and user library. There is NO Firefox/Mozilla anywhere on this machine. Can't re-install the application because I get this error.
I guess this means good by Firefox.

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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 (be careful not to copy corrupted files)
See:
*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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After removing system fonts and reinstalling fonts, FireFox will not start! When I start FireFox the "Mozilla Crash Reporter" opens as if FF just crashed??? I don't see any records in event viewer. I am using FF v3.6.3 on a Windows 7 box. I tried uninstalling 3.6.3 and installing 3.0.18 and had the same problem!
== This happened ==
Every time Firefox opened
== After a uninstalled all fonts including system fonts and then reinstalling system fonts. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.4; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; AskTB5.5)

The files with submitted crash report ids are inside the ''submitted '' directory, from the directory you found the LastCrash.txt timestamp file.
The file names will begin with '''bp-'''
There might be more information from the crash report, but it might just tell us you are crashing the first time Firefox tries to use a font.
One thing I suppose you could do is select only those fonts you've got in Tools -> Options -> Content -> Fonts and Colors -> Advanced and then uncheck the '''Allow pages to use their own fonts''' option.
See http://support.mozilla.com/en-US/kb/Options+window+-+Content+panel#Fonts_Dialog
To be honest, I can't find anything on this Netscape Font Navigator and it sounds highly dubious.

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''how do I get rid of ask.com''
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:'''https://support.mozilla.com/questions/868741'''
<br><small>Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.</small>
a good starting place for problems with extensions and toolbars are
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:http://kb.mozillazine.org/Uninstalling_toolbars

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hello sid.robinson, this crash is caused by the "Digital Guardian" software by Verdasys that is running on your computer. Please see if there's an update available for that program.

Firefox will not start, after reboot.

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== This happened ==
A few times a week
== Around the time 3.5 was released

Hello Tom.
You may be 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 coming from 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] and select ''Disable all add-ons''. 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 theme. You can troubleshoot plugins the same way.
If you want support for one of your add-ons, you'll need to contact its author.

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!

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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

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Location: chrome://mozapps/content/profile/profileSelection.xul
Line number 18, Column 1:
<dialog
^
Running on Windows XP SP3. No problem whatsoever before upgrading to 27. Sending this from Chrome as I cannot open Firefox at all.

Thanks jschaer2000: after starting it once in safe mode, I closed Mozilla and tried several restarts in normal mode. So far, all worked:-)
Thank you very much again.
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I also have this problem. I cannot open links from a discussion board I frequent nor can I open links from my email. Also after opening my email, I cannot go to any other sites except my home page. I can then go no where else.
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I have reinstalled Firefox so it will run in order to perform the steps requested below.

Try this
*https://support.mozilla.org/en-US/kb/firefox-wont-start-find-solutions
Open TaskManager, if it running '''firefox.exe''' > end all processes
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!

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== This happened ==
Every time Firefox opened
== 5/19/2010 ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; FunWebProducts; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; msn OptimizedIE8;ENUS)

It sounds like you may have a problem caused by an extension (maybe that avery toolbar)
[[Troubleshooting extensions and themes|Try the instructions in this article]] - begin by putting Firefox in Safe Mode. If Firefox will start in safe mode, continue with the section [[Troubleshooting extensions and themes|#Disable_all_extensions|Disable all extensions]] and then [[Troubleshooting extensions and themes|#Test_for_faulty_extensions|Test for faulty extensions]]
I hope that helps. Let us know if you can.

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== After overnight reboot by auto Windows update

I had the problem after I restarted the computer when Firefox indicated that was needed to install updates. After that every attempt to start Firefox resulted in no response at all. I went to my program list and found Firefox Safe Mode. That started OK. I then closed it. After that Firefox started OK.
Bob G.

Firefox Will Not Start Up

Firefox Will Not Start - I have tried the Profile Manager to create a new profile, but when I try, it goes to a different screen explaining that "Firefox had a problem and crashed. We'll try to restore your tabs and windows when it restarts" But Firefox will not restart when we prompt it to.
== This happened ==
Every time Firefox opened
== I was browsing videos online

Make sure that Firefox is completely closed, when you try to run the profile manager.
Can you try to get your crash report ID (without opening Firefox) using the instructions at https://support.mozilla.com/en-US/kb/Firefox+crashes+when+you+open+it#Getting_your_crash_report

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Just installed Firefox 3.6. Firefox will not start and Firefox safemode does not start either. Using Task manager I do not see if started either. If I create a new profile and start from that window, Firefox starts up. I see no error windows/messages. I do have it listed in my Firewall as an exception program with Permit All. What is happening?
== This happened ==
Every time Firefox opened
== After removing Firefox and Reinstalling it. ==
== User Agent ==
Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6.4; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; MS-RTC LM 8)

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See http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox
See also [[Basic Troubleshooting|#Make_a_new_profile|Basic Troubleshooting: Make a new profile]]

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- uninstalling and reinstalling mozilla with no success.
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Please help.

What is your computer system, and what Firefox are you using?
Start your '''Computer''' in safe mode. Then start Firefox. Try '''Safe''' web sites.
'''[http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting The Computer In Safe Mode;<br>Free Online Encyclopedia]'''

Firefox will not start--a series of problems.

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