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Next, create your mozilla.cfg file. Open Firefox and enter about:config in the address bar to see all of the available configuration options. Note that the first line must a comment, any options configured in the first line will be ignored.
If using an obscured config, this should be saved as mozilla.txt instead and converted to an obscured mozilla.cfg. Online Normaly you can do a online conversionat: http://alain.knaff.linux.lu/howto/MozillaCustomization/cgi/byteshf.cgiUnfortunately this web site is out of order for now.
If any issues you may alternatively run moz-byteshift.pl available here - https://developer.mozilla.org/en/Automatic_Mozilla_Configurator/Locked_config_settings
The perl interpreter is required - http://www.activestate.com/activeperl