Where are the about:config settings for a profile stored?

I am setting up a custom firefox profile and would like to tweak some of the options that are accessed via about:config.
I would like to know where this information is stored and whether I am able to modify these options outside of the browser.

Thanks, I was modifying the prefs.js file the whole time but didn't realize these were the same settings from about:config. The user.js file is also useful to know.

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