Firefox will not open for other users on a shared computer with individual accounts one day after installing Firefox

On a computer that is shared with multiple users(3),two of the users cannot open Firefox,only one user can. It shows the blue circle (Windows 7) but it disappears and does not open. Task Manager shows its running,but after closing,it won't open. Are there settings to adjust in Windows,or on Internet Options?
I am running Windows 7 Ultimate with SP1 installed.

Certain Firefox problems can be solved by performing a ''Clean reinstall''. This means you remove Firefox program files and then reinstall Firefox. Please follow these steps:
'''Note:''' You might want to print these steps or view them in another browser.
#Download the latest Desktop version of Firefox from http://www.mozilla.org and save the setup file to your computer.
#After the download finishes, close all Firefox windows (click Exit from the Firefox or File menu).
#Delete the Firefox installation folder, which is located in one of these locations, by default:
#*'''Windows:'''
#**C:\Program Files\Mozilla Firefox
#**C:\Program Files (x86)\Mozilla Firefox
#*'''Mac:''' Delete Firefox from the Applications folder.
#*'''Linux:''' If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it - see [[Installing Firefox on Linux]]. If you downloaded and installed the binary package from the [http://www.mozilla.org/firefox#desktop Firefox download page], simply remove the folder ''firefox'' in your home directory.
#Now, go ahead and reinstall Firefox:
##Double-click the downloaded installation file and go through the steps of the installation wizard.
##Once the wizard is finished, choose to directly open Firefox after clicking the Finish button.
Please report back to see if this helped you!

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I have multiple users (12-15) that share a computer. I installed firefox under my login (Admin). it opens on my login , but none of the other users can open firefox with their login. I have other computers that everyone can use firefox on their login so it is unique to this single computer.
== This happened ==
Every time Firefox opened
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Disabling all addons, didn't help. Moreover, I can't start FF in safe mode or start profile manager (Start > Run> firefox.exe -ProfileManager).
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Windows Event Viewer entry details:
Faulting application name: firefox.exe, version: 5.0.0.4183, time stamp: 0x4df95302
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x8c724fa6
Faulting process id: 0xc0c
Faulting application start time: 0x01cc37fe2fae7e8b
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Faulting module path: unknown
Report Id: 6e7f03eb-a3f1-11e0-8f4d-a4badb0238f6

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~Thank You
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Click here for more information --> [https://support.mozilla.com/en-US/kb/Cannot%20connect%20after%20upgrading%20Firefox Cannot connect after upgrading Firefox]
'''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.'''

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* http://kb.mozillazine.org/Browser_will_not_start_up
* http://kb.mozillazine.org/Error_loading_websites

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Start Firefox in <u>[[Safe Mode]]</u> 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

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Hi DoesFirefoxRespond,
Thank you for your questions. I understand that there is an issue with accessing some bank sites. If you have already disabled Firefox add ons and have still experienced the same issue, please try the following:
# Open a Private Window and login to the bank site to see if it causes the same issue. It will not use active logins or previous history.
# [[How to clear the Firefox cache]]
Please post back with your results, we are happy to help.

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If you use ZoneAlarm Extreme Security then try to disable Virtualization.
*http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
See also:
*[[/questions/880050]]

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First, Safe Boot , (holding Shift key down at bootup), use Disk Utility from there to Repair Permissions, test if things work OK in Safe Mode.
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/Users/YourUserName/Library/Preferences/com.apple.finder.plist
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/Users/YourUserName/Library/Preferences/com.apple.desktop.plist
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When you select a "group", it automatically selects everyone in that group.
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== This happened ==
Every time Firefox opened
== I closed the navigation bar to gain more space on the screen and I couldn't re-open it. ==
== 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)

Hit the '''Alt''' key to show the Menu bar, then open View > Toolbars and select Menu bar and Navigation bar, so they have a check-mark.

Firefox will not open for other users on a shared computer with individual accounts one day after installing Firefox

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