You need to exit the process in the task manager first. If this is happening all the time, you may have a malware problem. See this page:

• http://kb.mozillazine.org/Firefox.exe_always_open

Hi finitarry, Thanks for your reply. I have closed all the processes and services after that I am trying to opening it. And also I have scan my system with anti malware software but there is nothing to affecting it.

A possible cause is security software (firewall,anti-virus) that 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 internet 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

Thanks cor-el, As per your advise I did the same, I have removed every thing. Actually a Install my firefox again after uninstalling it. But still I am getting the same problem the newly installed mozila is not opening only.

Try a clean reinstall and delete the Firefox program folder before reinstalling a fresh copy of Firefox.

• C:\Program Files\Mozilla Firefox\
• http://kb.mozillazine.org/Installation_directory

Download a fresh Firefox copy and save the file to the desktop.

• Firefox 16.0.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.

If you keep having problems then also create a new profile.

• http://kb.mozillazine.org/Profile_folder_-_Firefox
• http://kb.mozillazine.org/Profile_backup

• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Clean_reinstall

Thanks cor-el, I deleted all the programs related to mozila from every where into the system. Its opening now but I don't know when I shut down my PC It'll work or what. Any ways thanks for helping with this issue.

I hope you shut down Firefox before you shut down your PC. You should close running applications before closing the operating system.

yes finitarry.. I shut down firefox before I shut down my PC, Its working now as per my above post I perform the same then the problem has been solved now. Thanks to every one to guide me, Thank you very much...