To improve font rendering in Leap 42.3 I’ve installed freetype from :
https://software.opensuse.org/download.html?project=home%3Anamtrac%3Asubpixel&package=freetype2
and it really improved the overall system look.
But Thunderbird proved to be a troublesome beast - with lcdfilter enabled font rendering in it is really messed up (I get some dots near letter and other nastiness). Any ideas how could I “fix” it?