/*= Windows7 - Aero Based Theme ==============================================*/
@include OS($win7) {
  #TabsToolbar:not(:-moz-lwtheme) {
    --background-color: rgb(229, 229, 235);
    --toolbarseparator-color: transparent;
  }
  #TabsToolbar:not(:-moz-lwtheme)
    .tabbrowser-tab
    > .tab-stack
    > .tab-background:not([selected="true"], [multiselected]) {
    color: var(--background-color);
    background-color: color-mix(in srgb, currentColor 60%, transparent);
  }
  #TabsToolbar:not(:-moz-lwtheme)
    .tabbrowser-tab:hover
    > .tab-stack
    > .tab-background:not([selected="true"], [multiselected]) {
    background-color: color-mix(
      in srgb,
      currentColor 85%,
      transparent
    ) !important; /* Original: color-mix(in srgb, currentColor 11%, transparent) */
  }
  #scrollbutton-up:not(:-moz-lwtheme),
  #scrollbutton-down:not(:-moz-lwtheme),
  #alltabs-button:not(:-moz-lwtheme) > .toolbarbutton-badge-stack,
  #TabsToolbar:not(:-moz-lwtheme) .toolbarbutton-1 > .toolbarbutton-icon {
    color: var(--background-color) !important;
    background-color: color-mix(in srgb, currentColor 50%, transparent);
  }
}