Firefox 44 appears to have snuck in a change in font handling: Bitmap fonts are no longer used. At least that's what I see with only the default fonts installed (xenocara defaults plus ghostscript since that gets pulled in as a dependency).
This has two effects I noticed: (1) For Latin script which is otherwise rendered with DejaVu, some butt-ugly bitmap font (Lucida, I think) would occasionally sneak through on some sites. This no longer happens. (2) The default CJK fonts are no longer displayed, easily verifiable under {ja,ko,zh}.wikipedia.org. I now only get squares with Unicode numbers. Now, I'm not saying this is necessarily a bad thing. I doubt anybody will complain about (1). People who actually read CJK text and are potentially affected by (2) probably have better fonts installed anyway since those shipped with xenocara are really poor. Landry tells me he can't reproduce this, which is even weirder. -- Christian "naddy" Weisgerber na...@mips.inka.de