The purpose of GM_config is to create a lightweight graphical settings dialog that can be easily used in user scripts through @require. A scriptwrighter using GM_config will pass an JSON object that contains the information about the values to be stored.
The Userscripts.org GM_config Dev Group is where the main development goes down. This Google Code page is just for hosting the code.
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These details are provided for information only. No information here is legal advice and should not be used as such.