How to disable sidebar font smoothing (antialiasing) in Firefox 89?

OS: Windows 7
Firefox: 89.0 (32-bit)
Description: Fonts in the sidebar (history, bookmarks) are blurred (like when ClearType is on). All other application fonts (Firefox UI, web pages) are OK.

I've tried these settings in userChrome.css without luck:

.sidebar-placesTree treechildren::-moz-tree-cell-text {
    font-smooth: never !important;
    -webkit-font-smoothing: none !important;
}

How can I disable this smoothing?

about:config

gfx.text.disable-aa = true

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