Formatting name for "cookies-from-browser" in conf json file?

[rudolphos]

I can only find command flag --cookies-from-browser but nowhere can I find how to properly config this inside of conf file.
"cookies-from-browser": "firefox" has not worked for me.

[mikf]

The config file equivalent for --cookies-from-browser firefox is "cookies": ["firefox"].
See the third section of extractor.cookies for details and examples.