Bug 1303460

I can revert to the previous behaviour by setting gfx.font_rendering.fontconfig.fontlist.enabled to false

Just updated to firefox-44.0-3 and font matching went haywire even though I only have systemwide font aliases (/etc/fonts/*). I'm not even sure where does it take the rules from as it started matching sans-serif to Comfortaa and ignored Arial (which is installed).

Making the same config change as Fabrice did, brought everything back to normal.

Right, in my case it seems this font-family rule:
"Helvetica Neue",Helvetica,Arial,sans-serif
and my font config, ended up matching Helvetica to sans-serif directly and then changes in Firefox's font matching logic matched sans-serif (somewhat randomly) to Comfortaa (which among some other fonts have <prefer> for sans-serif in my case) instead of falling back to Arial. So changes to my font configuration (removing <prefer>s for some fonts) ended up somehow matching to Arial in the end with fontlist enabled.

Still this is quite unexpected as fc-match produces different results for sans-serif:
$ fc-match sans-serif
DejaVuSans.ttf: "DejaVu Sans" "Book"

Ah, this must explain why GitHub has started looking terrible. Code blocks use the rule [Consolas, "Liberation Mono", Menlo, Courier, monospace], but somehow Firefox picks NimbusMonL-Regu even though Liberation Mono is installed

Is that a dupe of Bug 1303585 ?

(In reply to Martin Stransky from comment #5)
> Is that a dupe of Bug 1303585 ?

Hi,

It looks related yes, even If I cannot reproduce exactly the same behavior than the one reported on this other bug report (FF is not concerned by the fonts defined for gnome with gnome-tweak-tool).

The problem I observe happens when "font.name.sans-serif.x-western" is _NOT_ defined and when font.default.x-western is set to sans-serif. In this case, firefox uses the family alias I defined in my ~/.config/fontconfig/fonts.conf  file for sans-serif.

The difference I observe between FF43 and FF44 is that FF44 no longer seems to accept a family font containing the style part of the font : in the case of the font "DejaVu Sans Condensed", "Condensed" is the style, note the " " in the description of the font:

[bellet@bonobo conf.d]$ fc-match  sans-serif
DejaVuSansCondensed.ttf: "DejaVu Sans" "Condensed"
[bellet@bonobo conf.d]$ fc-match -v sans-serif | head
Pattern has 36 elts (size 48)
	family: "DejaVu Sans"(s) "DejaVu Sans Condensed"(s)
	familylang: "en"(s) "en"(s)
	style: "Condensed"(s) "Book"(s)
	stylelang: "en"(s) "en"(s)
	fullname: "DejaVu Sans Condensed"(s)
	fullnamelang: "en"(s)
	slant: 0(i)(s)
	weight: 80(i)(s)
	width: 87(i)(s)


Firefox renders using "DejaVu Sans" font in this case.

Switching to family "Roboto Condensed" in the local fonts.conf works, because Condensed belongs to the family name of this font.

Alternatively, defining the font with font.name.sans-serif.x-western works as expected with a visible difference between "DejaVu Sans" and "DejaVu Sans Condensed".

HTH,

Firefox 45 should have a fix in fontconfig code - can you please test FF45 Beta? From http://archive.mozilla.org/pub/firefox/candidates/45.0b10-candidates/build1/ for instance. Choose the 64bit or 32bit builds.

nope, bug is still there.

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The problem is still there in firefox 50, Fedora 24. Bumping fedora version.

I have similar problem with Firefox 50.1.0 on Fedora 25. Every font that isn't installed on my computer is substituted for default serif font, even if that particular font has different family aliased in /etc/fonts/conf.d/45-latin.conf.
For example Verdana is defined as sans-serif but Firefox substitutes it for "DejaVu Serif".

$ fc-match Verdana
DejaVuSans.ttf "DejaVu Sans" "Book"

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I reopen this bug, since the bug is still there in firefox 55, and the workaround gfx.font_rendering.fontconfig.fontlist.enabled=false no longer works.

https://bugzilla.mozilla.org/show_bug.cgi?id=1285533

It seems related to the Family/Subfamily and Preferred Family/Preferred Subfamily distinction that is specific to some fonts, including DejaVuSansCondensed, see:

https://forums.gentoo.org/viewtopic-t-566403.html

and an old mozilla bug:

https://bugzilla.mozilla.org/show_bug.cgi?id=420628

Editing the DejaVuSansCondensed*ttf files, by removing the Preferred* TTF Names, and copying these patched versions in ~/.local/share/fonts makes it work again. Ideally a similar workaround involving just a fonts.conf tweak would be better.

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