OK, re-enabling userChrome.css according to
http://forums.mozillazine.org/viewtopic.php?f=30&t=3064381&start=6
and creating a userChrome.css as follows:
/* Thunderbird userChrome.css */
@namespace
url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";);
#folderTree > treechildren::-moz-tree-image {
width: 10px !important;
height: 10px !important;
}
#folderTree > treechildren::-moz-tree-cell-text {
padding-bottom: 1px !important;
}
provides a temporary solution!
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https://bugs.launchpad.net/bugs/1918249
Title:
Icons in folder pane don't scale for hidpi, breaks rendering
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