Some more info on what I've found on my system...
The problem seems to be with fonts that have px units for font-size
(let's call them "px fonts") vs. fonts with pt as font-size unit ("pt
fonts"). Pt fonts match GNOME fonts of equal point sizes exactly with
layout.css.dpi=0 and vary directly in proportion to layout.css.dpi for
values >0. Px fonts are unreasonably small with layout.css.dpi=0 and are
not affected by any value of layout.css.dpi from 0 through 191. At
layout.css.dpi=192, px fonts suddenly double in size. They are
unaffected by layout.css.dpi from 192 to 257. At layout.css.dpi=258,
they grow another 50%.
It seems px fonts only vary at multiples of 96dpi, with a minimum of
96dpi. At the multiples of 96dpi, we have the traditional correspondence
between px and pt: 96px=72pt. In between the multiples, the ratio gets
lopsided, e.g., at layout.css.dpi=191, we have 96px~=36pt.
It seems to me the correct behavior would be for px fonts to vary
directly with layout.css.dpi, maintaining approximately 96px=72pt for
any DPI setting.
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Firefox layout.css.dpi ignored in Kubuntu
https://bugs.launchpad.net/bugs/301158
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