Explainations of preferences

This is probably the wrong category for my question but I cannot work out where else it fits so …

Where is there a user-level explanation of the preferences in about:config? For example for media.autoplay.blocking.policy what do the numbers mean? Or app.normany.first_run?

When using about:config it would help greatly if explanitory text were available.

hmm, IMO you should go to your browser : Settings -> Privacy & Security -> scroll down a bit and set the “Autoplay” options there.

Probably but it isn’t only the autoplay options that I’m looking for explanations of their purpose. Especially difficult to know what to set some preferences to when all one sees is a number; is it a number or a bit code and anyway what does the preference mean anyway.