Firefox ignores Windows 8's compatability setting for high dpi screens.

I recently tried the Windows 8.1 Preview, but then reset my machine to Windows 8 again.
Before this, the first time I installed Firefox, it ran at a low resolution, so all the toolbars and content appeared huge and blurry. I fixed this with the Windows 8 compatibility setting disable display scaling on high DPI settings"
After resetting the machine, and installing Firefox again, it was back to being blurry, so I changed the compatibility setting again, but this time, nothing happened. Even with the setting on, Firefox ignores it. Every other program with this setting works fine, and Firefox worked fine the last time around.
I was advised in the Windows support forums to ask the question here.

You can modify the layout.css.devPixelsPerPx and increase or decrease the value in 0.1 or 0.05 steps to adjust the size of fonts and other elements in Firefox.
*The layout.css.devPixelsPerPx pref is a String value parsed to a float and allows to fine tune the dimensions of all elements (user interface and web pages) more precisely (resolution 0.1 or 0.05).
*Change the default value -1 to 1 to make it work like in previous Firefox versions (100%)
Start with a value of 1 and adjust this value with 0.1 steps or 0.05 for finer adjustments.
*Use values between 1.0 and about 0.5 to reduce elements in size (do NOT go all the way to 0.05!)
*Use values greater than 1.0 to magnify and make elements larger (percentage divided by DPI, % / DPI).
*http://kb.mozillazine.org/about:config
If web pages needs to be adjusted after changing this pref then you can look at the Default FullZoom Level or NoSquint extension.
*Default FullZoom Level: https://addons.mozilla.org/firefox/addon/default-fullzoom-level/
*NoSquint: https://addons.mozilla.org/firefox/addon/nosquint/
Use this extension to adjust the font size for the user interface:
*Theme Font & Size Changer: https://addons.mozilla.org/firefox/addon/theme-font-size-changer/

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Firefox ignores Windows 8's compatability setting for high dpi screens.

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