Can't see about:config, need to reset

So, I was trying to test the effectiveness of retina images in this site that I'm building, and I inadvertently set layout.css.devPixelsPerPx to something absurd like -12. Now I can't see anything on the page, and I need to reset the configurations blindly. Is there a way to do this in a url string? Or anything else? Any and all help would be greatly appreciated.
Best,
- Kyle

You could try to search for prefs.js -- but you need to use whatever tricks are appropriate for searching in hidden folders.
I found this old article that might help: http://lifehacker.com/5711409/how-to-search-for-hidden-packaged-and-system-files-in-os-x

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