Changes
→Setting and Locking Preferences
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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 be 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. Normaly you can do a online conversion at: http://alain.knaff.linux.lu/howto/MozillaCustomization/cgi/byteshf.cgi