use Windows Explorer to extract the contents. See: https://developer.mozilla.org/en/About_omni.jar

There is no need to edit files in the omni.ja! archives to achieve this.

• http://mike.kaply.com/2013/05/06/dont-unpack-and-repack-omni-jar/
• http://mike.kaply.com/2012/03/26/customizing-firefox-distribution-ini/

If you need to initialize specific files in a new profile then create a template folder in the Firefox program folder (C:\Program Files\Mozilla Firefox\browser\defaults\profile\) and place the files in that folder.

• http://mike.kaply.com/2013/04/24/major-changes-coming-in-firefox-21/

• http://mike.kaply.com/2012/03/16/customizing-firefox-autoconfig-files/

i get error only for firefox 17.0.2 OS is windows and language is EN-US

Try to update your firefox version to 24.0 here Mozilla.org

i need to create new package for this version from Firefox with customize settings and not to update it to 24.0

See also Client Customization Kit:

• CCK Wizard: https://addons.mozilla.org/firefox/addon/cck/

i need to create new package for this version from Firefox with customize settings before installing it because the new package have new theme not same as Firefox theme and should be shown in installation steps and i am changing the default settings to customized settings which include new logo and banner and to set default bookmark shown in bookmark toolbar

thanks the i solved it just open omni.ja with out extract it using any program can open files and modified it