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What did I set to adjust the display DPI?

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I've carried forward settings from long ago in my profile and I'm trying to figure out what my old settings are that control the scaling of the display. On older displays, I had made a point of using the native resolution for images to avoid blurring, and then changed font sizes to fit. In about:config I've found: 

layout.css.devPixelsPerPx=1
layout.css.dpi=144

but copying those to a new profile gives me a tiny display on my higher-res screen. Changing layout.css.devPixelsPerPx works as expected, but layout.css.dpi seems to be a red herring--changing it has no effect in old or new profile. I vaguely remember replacing it with something else after a design change, but I'm not finding it either in about:config or in my userContent.css. It must be something that applies to the page content and not the UI, because my old settings don't affect the menu text and I had to adjust that size in userChrome.css.

(I'm trying to figure this out to diagnose a problem with a web site at work, which doesn't compute the window size correctly with my settings and refuses to display a menu sidebar at my usual window width.)

I've carried forward settings from long ago in my profile and I'm trying to figure out what my old settings are that control the scaling of the display. On older displays, I had made a point of using the native resolution for images to avoid blurring, and then changed font sizes to fit. In about:config I've found: layout.css.devPixelsPerPx=1 layout.css.dpi=144 but copying those to a new profile gives me a tiny display on my higher-res screen. Changing layout.css.devPixelsPerPx works as expected, but layout.css.dpi seems to be a red herring--changing it has no effect in old or new profile. I vaguely remember replacing it with something else after a design change, but I'm not finding it either in about:config or in my userContent.css. It must be something that applies to the page content and not the UI, because my old settings don't affect the menu text and I had to adjust that size in userChrome.css. (I'm trying to figure this out to diagnose a problem with a web site at work, which doesn't compute the window size correctly with my settings and refuses to display a menu sidebar at my usual window width.)

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