今自分が使ってる文字セッティングは
Firefox ESR 115.21.0 での　（⚠ v123以上からはwebkit-text-strokeの処理が穢い）

* {-webkit-text-stroke: 0.2px !important;}
* {text-shadow: 0px 0px 0.36px #acacac80 !important;}
* {font-family: "ヒラギノUD角ゴ StdN",
"Material Icons",
"icon", "FontAwesome", "Font Awesome 5 Brands", "Font Awesome 5 Free",
"Google Symbols",
"VideoJS", /* Wikipedia */
"icomoon", /* Yahoo! ニュース動画 */
"utIcon",
"ichiba-icon-font", "rex-icon", "fricon", /* 楽天系 */
"AmebaNewSymbols", "ameba-symbols",
"nsiconfont", /* 日刊スポーツ */
"Iconochive-Regular",
"Support MDL2 Assets", "Support Fluent Assets", /* Microsoft */
"Glyphicons Halflings" /* bokete */
!important;}

::selection{
color: #000; /*選択時の文字色を指定*/
background: #c0c0c0; /*選択時の背景色を指定*/}