Firefox won't open and displays error "/usr/lib64/firefox/firefox: symbol lookup error: /usr/lib64/firefox/libxul.so: undefined symbol : gdk_window_get_visual

Updated Firefox to 31.2 on RHEL6 - Red Hat Enterprise Linux Server release 6.0 (Santiago):
[RHEL6-1 ~]$ rpm -qa firefox xulrunner nspr
firefox-31.2.0-3.el6_6.x86_64
nspr-4.10.6-1.el6_5.x86_64
xulrunner-17.0.10-1.el6_4.x86_64
But when trying to launch firefox the following error is displayed:
[RHEL6-1 ~]$ firefox
/usr/lib64/firefox/firefox: symbol lookup error: /usr/lib64/firefox/libxul.so: undefined symbol: gdk_window_get_visual
I've tried removing and installing and always seem to get this error.
Any help is much appreciated!

RedHat provided firefox works if you update GTK2
Run:
# yum update gtk2*
See (login required):
https://access.redhat.com/solutions/1239853

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Tried to use Restore to return to pre-Firefox4 but now Firefox won't open and won't uninstall.

After trying to maneuver the new Firefox 4.0 for a while and giving up, I wanted to go back to the 3.6.1.6 version. I used the Restore feature to try to go back to the pre-Firefox 4.0 dowload. Since then, Firefox won't open. I have tried to uninstall Firefox 3.6.1.6, which is listed in my installed programs in the Control Panel, but it doesn't do anything. At this point I don't know what to do. I want to re-instate the 3.6.1.6 version on my computer. Thanks.

You're in a bit of a pickle here because you can't use System Restore to revert to 3.6.16. You probably now have version 1.9.2.x which is in part, files which were not removed when you installed FF4
What you can try and do is use System Resore to undo the last restoration which should take you back to 4.0 again. If that fails, see this article: http://kb.mozillazine.org/Uninstalling_firefox
If the undo restoration is successful, do the following to revert to 3.6.16
Go to [http://www.mozilla.com/en-US/firefox/all-older.html Download Firefox v3.6.16] and download it to the desktop. If necessary, download the file with IE8 and choose to save it to your desktop when you see the prompt.
Then go to Add/Remove Programs, scroll down to Mozilla Firefox and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).
Then reboot and delete the folder called '''Mozilla Firefox''' at this location: ''C:\Program Files\Mozilla Firefox''
Finally run the installation file you downloaded to the desktop earlier.
Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

Firefox won't open and gives me an error that it is already open when it isn't.

Whenever Firefox crashes or I restart the computer, I get this message that I can't open a new browser because Firefox is already open.
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I have the same problem when I'm trying to browse ringtones and stuff for my phone (browsing on my pc) on the site mytinyphone.com .. and when I click the "OK" button, it redirects the page that I am on to some other page, and when I click the back button in firefox to go back, it pops up and same thing happens.

Firefox won't open and neither will Profile Manager.

I running Windows 7 Professional. So about two weeks ago I had suddenly was unable to open Firefox and since then have been trying to solve it myself to no avail. the Firefox process opens in the task-manager, however, the browser window does not appear. When trying to open Firefox again, another process opens and the same thing happens. Processes just keep opening and that's it. I have tried the Profile manager but it only opened once and I have been unable to get it to open again. Every once in a while Firefox actually opens when I launch it, but when I close it to see if it works again it does not. Firefox does open in Safe-mode with Networking with no problems consecutively. While it was in safe-mode I ran a full system scan with Nortan Antivirus and cleared about thirty threats but after the restart Firefox still won't open, only processes. I have tried deleting Mozilla from the x86 path and cleared My local and roaming Mozilla appdata, then re installed with 34.0.5. I have tried opening Firefox in safe mode but it won't open at all, only the process again.

''cor-el [[#answer-668399|said]]''
<blockquote>
It is possible that your security software (firewall, anti-virus) 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 install 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
*https://support.mozilla.org/kb/fix-problems-connecting-websites-after-updating
Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.
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: http://windows.microsoft.com/en-us/windows/using-defender
*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
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
*https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware
</blockquote>
My firewall has been off for ages. And I did a check with Nortan. It didn't help.
EDIT: Turns out I was just being lazy I guess. I had read this post before on another user and it didn't work for him so I didn't try it. AWD did clean a lot of stuff but didn't work, Malwarebytes however cleaned more things and suddenly Firefox opens each time I try. Not sure if it is permanent yet.

Firefox won't open and won't uninstall so I can re-install and start anew. HELP!

I'm on a Dell laptop with Windows Vista using the latest version of Mozilla Firefox. My son was playing a game online (addicting games website I think) and the whole game screen didn't show up, he had to scroll. I went to the top of the page and right clicked and closed the address bar and menu bar so they weren't in the way. I've done this in the past and it worked fine. Not this time! When I went back to put those bars back on I couldn't do it. I had no address bar, no forward, back, refresh and home buttons, no file, edit, view buttons etc. I looked in my internet settings and all over the place and couldn't figure out how to replace those bars. I uninstalled Firefox and reinstalled it but those bars still were not there. I did this again after deleting browsing history (cookies and all) in case this problem was saved in my preferences. Still, no bars or buttons. I tried to uninstall again but now it won't even uninstall! It stubornly stays right there! It also won't even open now! I click on the icon and it sits. I right click the icon and hit open and it sits. I'm dead in the water. I can't even sign in to Pogo anymore because IE crashes everytime. I hate IE.....HELP!

Right... Back to square one.
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Now delete the entire contents of your profile folder--you'll need to configure firefox anew. Do keep this window open, you'll need it again in a few moments.
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Hi,
I have been thru the tutorial and none of the steps solved the problem I am having with firefox. I just installed it on a new computer and it won't open. It says that it cannot run until process is ended or computer is restarted. Restarting and ending the process don't seem to help. The other tutorial step of deleting the lock file doesn't work either as I could not find a lock file.

Right... Back to square one.
- Open Internet Explorer, go to "www.mozilla.com" and download the installer for Firefox 3.6.12 and save it to your desktop.
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Go to your desktop, run the installer, start Firefox once, close it again and move your "places.sqlite" file from your desktop to your profile folder.
Now double-click Firefox and reconfigure it according to your preferences.
N.B.: Do get "MozBackup". With this application you're able to save and restore a working Firefox profile--for your next mishap ;-)

Sometimes firefox won't open and I have to 'end process', and others it won't let me search in the searchbar, or open a new window. What's going on?

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Do you have Restrictions turned on in Settings>General?

My firefox won't open at all on my user id on Windows 7, it keeps saying 'Firefox is allready running but isn't responding' etc.

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This is a translation of the text as my user language is finnish.
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You can try to move the entire Firefox folder to a different location to make Firefox create a new file structure for the profile folder.
* Vista/Windows 7: C:\Users\<user>\AppData\Roaming\Mozilla\Firefox\
* "Application Data" in XP/Win2K and "AppData" in Vista/Windows 7 are hidden folders.
* Use %APPDATA% in the File name field
* http://kb.mozillazine.org/Show_hidden_files_and_folders
Go to: Control Panel > Folder Options > "View" tab > under "Hidden files and folders", select "Show hidden files and folders" 
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See also:
* http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Firefox won't open and i keep getting this error

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Create a new profile as a test to check if your current profile is causing the problems.
See "Creating a profile":
*https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
*http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues
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*http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

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Did you look in the USER Library? Theses folders are hidden by default. See Access hidden user library files | Mac OS 10.7 and later

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Follow the instructions to create a new profile. Then test it.
After, you can move your files from the old profile to the new one.
'''https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles'''
'''https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile'''

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Tina,
I would go crazy if this was me. You may find this interesting from the customer agreement (to see full agreement go here:Customer Agreement | Verizon Wireless):
"HOW AND WHEN CAN I DISPUTE CHARGES?
If you're a Postpay customer, you can dispute your bill within 180 days of receiving it, but unless otherwise provided by law or unless you're disputing charges because your wireless device was lost or stolen, you still have to pay all charges until the dispute is resolved. If you're a Prepaid customer, you can dispute a charge within 180 days of the date the disputed charge was incurred. YOU MAY CALL US TO DISPUTE CHARGES ON YOUR BILL OR ANY SERVICE(S) FOR WHICH YOU WERE BILLED, BUT IF YOU WISH TO PRESERVE YOUR RIGHT TO BRING AN ARBITRATION OR SMALL CLAIMS CASE REGARDING SUCH DISPUTE, YOU MUST WRITE TO US AT THE CUSTOMER SERVICE ADDRESS ON YOUR BILL, OR SEND US A COMPLETED NOTICE OF DISPUTE FORM (AVAILABLE AT VERIZONWIRELESS.COM), WITHIN THE 180–DAY PERIOD MENTIONED ABOVE. IF YOU DO NOT NOTIFY US IN WRITING OF SUCH DISPUTE WITHIN THE 180-DAY PERIOD, YOU WILL HAVE WAIVED YOUR RIGHT TO DISPUTE THE BILL OR SUCH SERVICE(S) AND TO BRING AN ARBITRATION OR SMALL CLAIMS CASE REGARDING ANY SUCH DISPUTE."
This may help you also: Arbitration and Mediation FAQs | Verizon Wireless
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Let me know if any of this works! Good Luck! Please keep me updated. I really hope they help you.

Firefox won't open and displays error "/usr/lib64/firefox/firefox: symbol lookup error: /usr/lib64/firefox/libxul.so: undefined symbol : gdk_window_get_visual

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