There are a lot of settings in about:config, but I don't know what they do, and I haven't found information about them from Mozilla's website. I hope that some documentation should be detailed enough to include every setting item
This would be nice to have. Have a location that provides documentation on each config option available. If it were me it would be similar to a "man" page for linux where its just built into firefox so it can be accessed without needing to go somewhere else.
Maybe add a property that is a description or documentation per config entry. Gives developers the ability to write their heart out on what it does and what to expect from different options.