Created attachment 736886 [details]
screenshot

>From the screenshot, you can see that font in e. g. firefox tab descriptionsor
or on the page itself, or also on window captions (icewm), seem to be rendered
without hinting. Correct output I would expect is for example in yast window or
gpicview dialog (also see screenshot).

I use Liberation Sans (well instructed font) with antialiasing off, which leads
to sharp fonts. 

$ fc-match -v sans | grep 'family:\|alias\|hint'
    family: "Liberation Sans"(s)
    antialias: False(w)
    hintstyle: 3(i)(w)
    hinting: True(w)
    autohint: False(w)
    force_hintstyle: "none"(w)
    force_autohint: False(w)
    search_metric_aliases: True(w)
$

It does not look like freetype issue, as ftview renders glyphs correctly (see
the screenshot). It also does not look like this is just firefox issue as
window captions of the IceWM suffer too. gtk application (gpicview) has menu
rendered correctly.

This happened during some Tumbleweed update I made in august. I am sure I have
not change any font setting.