fenix-fox/chrome/context_menus_more_proton.css

/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/context_menus_more_proton.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

/* Adds more proton-like styling to context menus. Rounded rows, and more consistent padding. This is only going to work on Win10+ */

:root{
  --arrowpanel-menuitem-margin: 0 8px;
  --arrowpanel-menuitem-padding-block: 8px;
  --arrowpanel-menuitem-padding-inline: 8px;
  --arrowpanel-menuitem-border-radius: 4px;
  --panel-separator-margin-vertical: 4px;
  --button-hover-bgcolor: rgb(82, 82, 94);
}
/* OPTIONAL Set custom context menu colors below */
/*
menupopup:not(.in-menulist){
  --panel-background: #eb2a33 !important;
  --panel-color: #4aa !important;
}
*/

menupopup{
  --panel-item-hover-bgcolor: var(--button-hover-bgcolor);
  --panel-border-radius: var(--arrowpanel-border-radius) !important;
}
menupopup > menuitem,
menupopup > menu{
  appearance: none !important;
  margin: var(--arrowpanel-menuitem-margin) !important;
  min-height: 24px !important;
  padding: var(--arrowpanel-menuitem-padding-block) var(--arrowpanel-menuitem-padding-inline) !important;
  border-radius: var(--arrowpanel-menuitem-border-radius) !important;
  background-color: transparent !important;
}
#context-navigation{
  padding-inline: var(--arrowpanel-menuitem-padding-inline) !important;
}
.menu-right{
  margin-inline-end: initial !important;
}
menupopup:not(.in-menulist){
  --panel-padding: var(--arrowpanel-menuitem-padding-block) 0 !important;
}
menuseparator:not(.in-menulist){
  margin-block: var(--panel-separator-margin-vertical) !important;
}

#context-navigation > menuitem[_moz-menuactive] .menu-iconic-icon{
  border-radius: var(--arrowpanel-menuitem-border-radius) !important;
}
#context-navigation > menuitem[_moz-menuactive] .menu-iconic-icon,
menupopup > menuitem[_moz-menuactive],
menupopup > menu[_moz-menuactive]{
  background-color: var(--panel-item-hover-bgcolor) !important;
}
menupopup > menuitem[disabled][_moz-menuactive],
menupopup > menu[disabled][_moz-menuactive]{
  background-color: var(--menuitem-disabled-hover-background-color) !important;
}