Open about:config on web browser

I would like to open the advanced configuration on my web browser for Firefox OS. I have tried typing about:config into the Awesome bar, and then either keying 'enter' or using the Go arrow, to no result.
The following answer seems to imply that this is possible in Firefox for Android:
https://support.mozilla.org/en-US/questions/960501#answer-440285

The about:config "page" definitely exists in both desktop and Android versions of Firefox. However, when I search for about:config in the Firefox OS source code site, I don't find anything but a single comment. It sounds as though that particular page is not used on Firefox OS. Maybe there's a new name for it?

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