--- a/browser/modules/ThemeVariableMap.jsm
+++ b/browser/modules/ThemeVariableMap.jsm
@@ -77,22 +77,16 @@ const ThemeVariableMap = [
   ],
   [
     "--toolbar-color",
     {
       lwtProperty: "toolbar_text",
     },
   ],
   [
-    "--urlbar-separator-color",
-    {
-      lwtProperty: "toolbar_field_separator",
-    },
-  ],
-  [
     "--tabs-border-color",
     {
       lwtProperty: "toolbar_top_separator",
       optionalElementID: "navigator-toolbox",
     },
   ],
   [
     "--toolbarseparator-color",

--- a/browser/themes/addons/alpenglow/manifest.json
+++ b/browser/themes/addons/alpenglow/manifest.json
@@ -40,17 +40,16 @@
       "toolbar_vertical_separator": "hsla(261, 53%, 15%, .2)",
       "toolbar_field": "hsla(0, 0%, 100%, .8)",
       "toolbar_field_focus": "hsla(261, 53%, 15%, .96)",
       "toolbar_field_text": "hsla(261, 53%, 15%, 1)",
       "toolbar_field_text_focus": "hsla(255, 100%, 94%, 1)",
       "toolbar_field_border": "transparent",
       "toolbar_field_border_focus": "hsla(265, 100%, 72%, 1)",
       "toolbar_field_highlight": "hsla(265, 100%, 72%, .32)",
-      "toolbar_field_separator": "hsla(261, 53%, 15%, .32)",
       "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsla(261, 53%, 15%, .32)",
       "bookmark_text": "hsla(261, 53%, 15%, 1)",
       "tab_text": "hsla(261, 53%, 15%, 1)",
       "tab_background_text": "hsla(261, 53%, 15%, 1)",
       "tab_background_separator": "hsla(261, 53%, 15%, 1)",
       "tab_line": "hsla(265, 100%, 72%, 1)",
       "tab_loading": "hsla(265, 100%, 72%, 1)",
@@ -97,17 +96,16 @@
       "toolbar_vertical_separator": "hsla(271, 100%, 77%, .4)",
       "toolbar_field": "hsla(250, 43%, 25%, 1)",
       "toolbar_field_focus": "hsla(250, 43%, 25%, .98)",
       "toolbar_field_text": "hsla(255, 100%, 94%, 1)",
       "toolbar_field_text_focus": "hsla(255, 100%, 94%, 1)",
       "toolbar_field_border": "transparent",
       "toolbar_field_border_focus": "hsla(265, 100%, 72%, 1)",
       "toolbar_field_highlight": "hsla(265, 100%, 72%, .32)",
-      "toolbar_field_separator": "hsla(261, 53%, 15%, .32)",
       "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsla(245, 38%, 33%, .96)",
       "bookmark_text": "hsla(255, 100%, 94%, 1)",
       "tab_selected": "rgb(60, 31, 123)",
       "tab_text": "hsla(255, 100%, 94%, 1)",
       "tab_background_text": "hsla(255, 100%, 94%, 1)",
       "tab_background_separator": "hsla(255, 100%, 94%, 1)",
       "tab_line": "hsla(265, 100%, 72%, 1)",

--- a/browser/themes/addons/dark/manifest.json
+++ b/browser/themes/addons/dark/manifest.json
@@ -28,17 +28,16 @@
       "tab_line": "transparent",
       "toolbar": "rgb(43,42,51)",
       "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(240, 5%, 5%)",
       "toolbar_field": "rgb(28,27,34)",
       "toolbar_field_border": "transparent",
       "toolbar_field_text": "rgb(251,251,254)",
       "toolbar_field_focus": "rgb(66,65,77)",
-      "toolbar_field_separator": "rgb(82,82,94)",
       "toolbar_text": "#BFBFC9",
       "ntp_background": "rgb(28, 27, 34)",
       "ntp_text": "rgb(251, 251, 254)",
       "sidebar": "#38383D",
       "sidebar_text": "rgb(249, 249, 250)",
       "sidebar_border": "rgba(255, 255, 255, 0.1)",
       "button": "rgb(43,42,51)",
       "button_hover": "rgb(82,82,94)",
@@ -56,16 +55,17 @@
       "checkbox_checked_background_hover": "rgb(128, 235, 255)",
       "checkbox_checked_background_active": "rgb(170, 242, 255)",
       "error_text_color": "rgb(255, 154, 162)",
       "input_background": "#42414D",
       "input_color": "#BFBFC9",
       "input_border": "#8f8f9d",
       "input_border_error": "rgb(255, 132, 138)",
       "zoom_controls": "rgb(74,74,85)",
+      "autocomplete_popup_separator": "rgb(82,82,94)",
       "appmenu_update_icon_color": "#54FFBD",
       "appmenu_warning_icon_color": "#FFBD4F",
       "appmenu_info_icon_color": "#80EBFF"
     },
     "properties": {
       "panel_hover": "color-mix(in srgb, currentColor 9%, transparent)",
       "panel_active": "color-mix(in srgb, currentColor 14%, transparent)",
       "panel_active_darker": "color-mix(in srgb, currentColor 25%, transparent)"
@@ -90,16 +90,17 @@
       "checkbox_checked_color": "--checkbox-checked-color",
       "checkbox_checked_background_hover": "--checkbox-checked-hover-bgcolor",
       "checkbox_checked_background_active": "--checkbox-checked-active-bgcolor",
       "error_text_color": "--error-text-color",
       "input_background": "--input-bgcolor",
       "input_color": "--input-color",
       "input_border": "--input-border-color",
       "input_border_error": "--input-error-border-color",
+      "autocomplete_popup_separator": "--autocomplete-popup-separator-color",
       "appmenu_update_icon_color": "--panel-banner-item-update-supported-bgcolor",
       "appmenu_warning_icon_color": "--panel-banner-item-warning-icon-bgcolor",
       "appmenu_info_icon_color": "--panel-banner-item-info-icon-bgcolor"
     },
     "properties": {
       "panel_hover": "--arrowpanel-dimmed",
       "panel_active": "--arrowpanel-dimmed-further",
       "panel_active_darker": "--arrowpanel-dimmed-even-further"

--- a/browser/themes/addons/light/manifest.json
+++ b/browser/themes/addons/light/manifest.json
@@ -29,17 +29,16 @@
       "tab_line": "rgba(128,128,142,0.9)",
       "toolbar": "#f9f9fb",
       "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "#ccc",
       "toolbar_field": "#f0f0f4",
       "toolbar_field_text": "rgb(21,20,26)",
       "toolbar_field_border": "transparent",
       "toolbar_field_focus": "white",
-      "toolbar_field_separator": "rgb(240,240,244)",
       "toolbar_text": "rgb(21,20,26)",
       "ntp_background": "#fff",
       "ntp_text": "rgb(21, 20, 26)",
       "popup_action_color": "rgb(21,20,26)",
       "button": "rgb(240,240,244)",
       "button_hover": "rgb(224,224,230)",
       "button_active": "rgb(207,207,216)",
       "button_primary": "rgb(0, 97, 224)",
@@ -53,16 +52,17 @@
       "checkbox_checked_background": "rgb(0, 97, 224)",
       "checkbox_checked_background_hover": "rgb(2, 80, 187)",
       "checkbox_checked_background_active": "rgb(5, 62, 148)",
       "checkbox_checked_color": "rgb(251, 251, 254)",
       "panel_hover": "rgb(224,224,230)",
       "panel_active": "rgb(207,207,21)",
       "panel_active_darker": "rgb(191,191,201)",
       "autocomplete_popup_hover": "rgb(240,240,244)",
+      "autocomplete_popup_separator": "rgb(240,240,244)",
       "appmenu_update_icon_color": "#2AC3A2",
       "appmenu_warning_icon_color": "#FFA436",
       "appmenu_info_icon_color": "#0090ED"
     },
     "properties": {
       "panel_hover": "color-mix(in srgb, currentColor 12%, transparent)",
       "panel_active": "color-mix(in srgb, currentColor 20%, transparent)",
       "panel_active_darker": "color-mix(in srgb, currentColor 27%, transparent)"
@@ -84,16 +84,17 @@
       "checkbox_unchecked_background": "--checkbox-unchecked-bgcolor",
       "checkbox_unchecked_background_hover": "--checkbox-unchecked-hover-bgcolor",
       "checkbox_unchecked_background_active": "--checkbox-unchecked-active-bgcolor",
       "checkbox_checked_background": "--checkbox-checked-bgcolor",
       "checkbox_checked_background_hover": "--checkbox-checked-hover-bgcolor",
       "checkbox_checked_background_active": "--checkbox-checked-active-bgcolor",
       "checkbox_checked_color": "--checkbox-checked-color",
       "autocomplete_popup_hover": "--autocomplete-popup-hover-background",
+      "autocomplete_popup_separator": "--autocomplete-popup-separator-color",
       "appmenu_update_icon_color": "--panel-banner-item-update-supported-bgcolor",
       "appmenu_warning_icon_color": "--panel-banner-item-warning-icon-bgcolor",
       "appmenu_info_icon_color": "--panel-banner-item-info-icon-bgcolor"
     },
     "properties": {
       "panel_hover": "--arrowpanel-dimmed",
       "panel_active": "-arrowpanel-dimmed-further",
       "panel_active_darker": "--arrowpanel-dimmed-even-further"

--- a/browser/themes/shared/browser-custom-colors.inc.css
+++ b/browser/themes/shared/browser-custom-colors.inc.css
@@ -44,17 +44,17 @@
     --tab-line-color: rgba(128,128,142,0.9);
     --tab-selected-bgcolor: rgb(255,255,255);
     --tabs-border-color: transparent;
     --toolbar-color: rgb(21,20,26);
 
     --urlbar-popup-action-color: rgb(21,20,26);
     --urlbar-popup-url-color: rgb(0,97,224);
 
-    --urlbar-separator-color: rgb(240,240,244);
+    --autocomplete-popup-separator-color: rgb(240,240,244);
     --toolbar-field-border-color: transparent;
     --arrowpanel-border-color: transparent;
 
     --toolbar-field-non-lwt-bgcolor: rgb(240,240,244);
 
     --autocomplete-popup-highlight-background: var(--arrowpanel-dimmed);
     --autocomplete-popup-highlight-color: rgb(21,20,26);
     --autocomplete-popup-hover-background: rgb(240,240,244);

--- a/browser/themes/shared/browser.inc.css
+++ b/browser/themes/shared/browser.inc.css
@@ -27,35 +27,40 @@
   --button-color: currentColor;
 
   --buttons-destructive-bgcolor: #e22850;
   --buttons-destructive-hover-bgcolor: #c50042;
   --buttons-destructive-active-bgcolor: #810220;
   --buttons-destructive-color: #fbfbfe;
 
   --autocomplete-popup-hover-background: var(--arrowpanel-dimmed);
+  --autocomplete-popup-separator-color: color-mix(in srgb, currentColor 14%, transparent);
 
   --identity-box-margin-inline: 4px;
   --identity-box-label-opacity: .8;
   --urlbar-box-bgcolor: var(--button-bgcolor);
   --urlbar-box-hover-bgcolor: var(--button-hover-bgcolor);
   --urlbar-box-active-bgcolor: var(--button-active-bgcolor);
-
   --urlbar-min-height: 32px;
   --urlbar-icon-fill-opacity: 1;
   --urlbar-icon-padding: 6px; /* (32px - 2px border - 2px padding - 16px icon) / 2 */
-  --urlbar-separator-color: var(--panel-separator-color);
   --urlbar-popup-url-color: -moz-nativehyperlinktext;
 
   --lwt-additional-images: none;
   --lwt-background-alignment: right top;
   --lwt-background-tiling: no-repeat;
   --lwt-popup-brighttext-url-color: #74c0ff;
 }
 
+@media (prefers-contrast) {
+  :root {
+    --autocomplete-popup-separator-color: color-mix(in srgb, currentColor 86%, transparent);
+  }
+}
+
 @media not (-moz-proton) {
   :root {
     --focus-outline-width: 0;
     --identity-box-margin-inline: 3px;
     --identity-box-label-opacity: .6;
     --urlbar-icon-fill-opacity: .6;
   }
 } /*** END !proton ***/

--- a/browser/themes/shared/identity-block/identity-block.inc.css
+++ b/browser/themes/shared/identity-block/identity-block.inc.css
@@ -84,31 +84,32 @@
   border-radius: var(--toolbarbutton-border-radius);
 }
 
 @media not (-moz-proton) {
 .identity-box-button {
   padding-inline: calc(var(--urlbar-icon-padding) / 2);
   border-radius: 0;
 }
+
+#identity-box:not(.chromeUI, .extensionPage, .notSecureText) {
+  --autocomplete-popup-separator-color: transparent;
+}
 } /*** END !proton ***/
 
 #identity-box[pageproxystate="valid"].notSecureText #identity-icon-label,
 #identity-box[pageproxystate="valid"].chromeUI #identity-icon-label,
 #identity-box[pageproxystate="valid"].extensionPage #identity-icon-label,
 .urlbar-label {
   opacity: var(--identity-box-label-opacity);
 }
 
 #identity-icon-label {
   padding-inline-start: 4px;
 }
-#identity-box:not(.chromeUI, .extensionPage, .notSecureText) {
-  --urlbar-separator-color: transparent;
-}
 
 #identity-box[pageproxystate="valid"].notSecureText,
 #identity-box[pageproxystate="valid"].chromeUI,
 #identity-box[pageproxystate="valid"].extensionPage,
 #urlbar-label-box {
   margin-inline-end: 8px;
 }
 
@@ -148,31 +149,31 @@
   pointer-events: none;
 }
 
 @media not (-moz-proton) {
 #identity-box[pageproxystate="valid"].notSecureText,
 #identity-box[pageproxystate="valid"].chromeUI,
 #identity-box[pageproxystate="valid"].extensionPage,
 #urlbar-label-box {
-  border-inline-end: 1px solid var(--urlbar-separator-color);
-  border-image: linear-gradient(transparent 15%, var(--urlbar-separator-color) 15%, var(--urlbar-separator-color) 85%, transparent 85%);
+  border-inline-end: 1px solid var(--autocomplete-popup-separator-color);
+  border-image: linear-gradient(transparent 15%, var(--autocomplete-popup-separator-color) 15%, var(--autocomplete-popup-separator-color) 85%, transparent 85%);
   border-image-slice: 1;
 }
 
 #identity-box[pageproxystate="valid"].notSecureText > #identity-icon-box,
 #identity-box[pageproxystate="valid"].chromeUI > #identity-icon-box,
 #identity-box[pageproxystate="valid"].extensionPage > #identity-icon-box {
   padding-inline: 8px;
   border-radius: 0;
 }
 
 #urlbar-label-box {
   padding-inline: 4px;
-  border-inline-start: 1px solid var(--urlbar-separator-color);
+  border-inline-start: 1px solid var(--autocomplete-popup-separator-color);
   border-radius: 0;
 }
 
 #urlbar[searchmode]:not([breakout-extend]) > #urlbar-input-container > #urlbar-label-box {
   border-inline-start-color: transparent;
   border-image-width: 0 1px 0 0;
 }
 
@@ -327,18 +328,18 @@
   /* This is needed in order to position the blue dot indicator. */
   position: relative;
 }
 
 @media not (-moz-proton) {
 #tracking-protection-icon-container {
   border-radius: 0;
   /* Separator */
-  border-inline-end: 1px solid var(--urlbar-separator-color);
-  border-image: linear-gradient(transparent 15%, var(--urlbar-separator-color) 15%, var(--urlbar-separator-color) 85%, transparent 85%);
+  border-inline-end: 1px solid var(--autocomplete-popup-separator-color);
+  border-image: linear-gradient(transparent 15%, var(--autocomplete-popup-separator-color) 15%, var(--autocomplete-popup-separator-color) 85%, transparent 85%);
   border-image-slice: 1;
 }
 } /*** END !proton ***/
 
 #urlbar-input-container[pageproxystate="valid"] > #tracking-protection-icon-container.chromeUI {
   display: none;
 }
 

--- a/browser/themes/shared/searchbar.inc.css
+++ b/browser/themes/shared/searchbar.inc.css
@@ -243,17 +243,17 @@
   padding: var(--arrowpanel-menuitem-margin);
 }
 
 .searchbar-separator {
   appearance: none;
   margin: var(--panel-separator-margin);
   padding: 0;
   border: 0;
-  border-top: 1px solid var(--panel-separator-color);
+  border-top: 1px solid var(--autocomplete-popup-separator-color);
   color: inherit;
 }
 
 .search-panel-tree[collapsed=true] + .searchbar-separator {
   display: none;
 }
 
 @media not (-moz-proton) {

--- a/browser/themes/shared/urlbar-searchbar.inc.css
+++ b/browser/themes/shared/urlbar-searchbar.inc.css
@@ -588,18 +588,18 @@
 } /*** END proton ***/
 
 @media not (-moz-proton) {
 #pageActionSeparator {
   /* This draws the separator the same way that #urlbar-label-box draws its
      left and right borders, which end up looking like separators.  It might not
      be the best way in this case, but it makes sure that all these vertical
      lines in the urlbar look the same: same height, vertical position, etc. */
-  border-inline-start: 1px solid var(--urlbar-separator-color);
-  border-image: linear-gradient(transparent 15%, var(--urlbar-separator-color) 15%, var(--urlbar-separator-color) 85%, transparent 85%);
+  border-inline-start: 1px solid var(--autocomplete-popup-separator-color);
+  border-image: linear-gradient(transparent 15%, var(--autocomplete-popup-separator-color) 15%, var(--autocomplete-popup-separator-color) 85%, transparent 85%);
   border-image-slice: 1;
   width: 1px;
   visibility: hidden;
 }
 
 #page-action-buttons > :not([hidden], toolbartabstop) ~ #pageActionSeparator {
   /* Show the separator between the page actions and other elements when at
      least one of the latter is shown. */

--- a/browser/themes/shared/urlbarView.inc.css
+++ b/browser/themes/shared/urlbarView.inc.css
@@ -104,17 +104,17 @@
 }
 } /*** END !proton ***/
 
 .urlbarView-body-inner {
   width: 100%;
 }
 
 #urlbar[open] > .urlbarView > .urlbarView-body-outer > .urlbarView-body-inner {
-  border-top: 1px solid var(--urlbar-separator-color);
+  border-top: 1px solid var(--autocomplete-popup-separator-color);
 }
 
 .urlbarView-results {
   padding-block: @urlbarViewPadding@;
   white-space: nowrap;
 }
 
 /* Vertically center the one-offs when no results are present. */
@@ -692,23 +692,22 @@
 #urlbar .search-one-offs:not([hidden]) {
   display: flex;
   align-items: start;
   padding-block: 16px;
   flex-wrap: wrap;
 }
 
 .urlbarView:not([noresults]) > .search-one-offs:not([hidden]) {
-  border-top: 1px solid var(--panel-separator-color);
+  border-top: 1px solid var(--autocomplete-popup-separator-color);
 }
 
 @media (-moz-proton) {
 #urlbar .search-one-offs:not([hidden]) {
   padding-block: 6px;
-  border-top-color: var(--urlbar-separator-color);
 }
 
 :root[uidensity=touch] #urlbar .search-one-offs:not([hidden]) {
   padding-block: 11px;
 }
 } /*** END proton ***/
 
 #urlbar .search-panel-one-offs-container {

--- a/toolkit/components/extensions/parent/ext-theme.js
+++ b/toolkit/components/extensions/parent/ext-theme.js
@@ -204,17 +204,16 @@ class Theme {
         case "tab_background_separator":
         case "tab_loading":
         case "tab_text":
         case "tab_line":
         case "tab_selected":
         case "toolbar_field":
         case "toolbar_field_text":
         case "toolbar_field_border":
-        case "toolbar_field_separator":
         case "toolbar_field_focus":
         case "toolbar_field_text_focus":
         case "toolbar_field_border_focus":
         case "toolbar_top_separator":
         case "toolbar_bottom_separator":
         case "toolbar_vertical_separator":
         case "button_background_hover":
         case "button_background_active":

--- a/toolkit/components/extensions/schemas/theme.json
+++ b/toolkit/components/extensions/schemas/theme.json
@@ -166,17 +166,18 @@
                 "optional": true
               },
               "toolbar_field_border": {
                 "$ref": "ThemeColor",
                 "optional": true
               },
               "toolbar_field_separator": {
                 "$ref": "ThemeColor",
-                "optional": true
+                "optional": true,
+                "deprecated": "This color property is ignored in Firefox >= 89."
               },
               "toolbar_top_separator": {
                 "$ref": "ThemeColor",
                 "optional": true
               },
               "toolbar_bottom_separator": {
                 "$ref": "ThemeColor",
                 "optional": true

--- a/toolkit/components/extensions/test/browser/browser_ext_themes_separators.js
+++ b/toolkit/components/extensions/test/browser/browser_ext_themes_separators.js
@@ -15,45 +15,51 @@ add_task(async function test_support_sep
         images: {
           theme_frame: "image1.png",
         },
         colors: {
           frame: ACCENT_COLOR,
           tab_background_text: TEXT_COLOR,
           toolbar_top_separator: SEPARATOR_TOP_COLOR,
           toolbar_vertical_separator: SEPARATOR_VERTICAL_COLOR,
+          // This property is deprecated, but left in to check it doesn't
+          // unexpectedly break the theme installation.
           toolbar_field_separator: SEPARATOR_FIELD_COLOR,
           toolbar_bottom_separator: SEPARATOR_BOTTOM_COLOR,
         },
       },
     },
     files: {
       "image1.png": BACKGROUND,
     },
   });
 
+  // Test the deprecated color property.
+  let deprecatedMessagePromise = new Promise(resolve => {
+    Services.console.registerListener(function listener(msg) {
+      if (msg.message.includes("toolbar_field_separator")) {
+        resolve();
+        Services.console.unregisterListener(listener);
+      }
+    });
+  });
+  ExtensionTestUtils.failOnSchemaWarnings(false);
   await extension.startup();
+  ExtensionTestUtils.failOnSchemaWarnings(true);
+  info("Wait for property deprecation message");
+  await deprecatedMessagePromise;
 
   let navbar = document.querySelector("#nav-bar");
   Assert.ok(
     window
       .getComputedStyle(navbar)
       .boxShadow.includes(`rgb(${hexToRGB(SEPARATOR_TOP_COLOR).join(", ")})`),
     "Top separator color properly set"
   );
 
-  let mainWin = document.querySelector("#main-window");
-  Assert.equal(
-    window
-      .getComputedStyle(mainWin)
-      .getPropertyValue("--urlbar-separator-color"),
-    `rgb(${hexToRGB(SEPARATOR_FIELD_COLOR).join(", ")})`,
-    "Toolbar field separator color properly set"
-  );
-
   let panelUIButton = document.querySelector("#PanelUI-button");
   if (CustomizableUI.protonToolbarEnabled) {
     // XXX: This should test bookmark item toolbar separators instead
     Assert.equal(
       window
         .getComputedStyle(panelUIButton)
         .getPropertyValue("border-image-source"),
       "none",

--- a/toolkit/mozapps/extensions/default-theme/manifest.json
+++ b/toolkit/mozapps/extensions/default-theme/manifest.json
@@ -31,17 +31,16 @@
       "tab_line": "transparent",
       "toolbar": "#2b2a33",
       "toolbar_top_separator": "transparent",
       "toolbar_bottom_separator": "hsl(240, 5%, 5%)",
       "toolbar_field": "rgb(28,27,34)",
       "toolbar_field_border": "transparent",
       "toolbar_field_text": "rgb(251,251,254)",
       "toolbar_field_focus": "rgb(66,65,77)",
-      "toolbar_field_separator": "#5F6670",
       "toolbar_text": "#BFBFC9",
       "ntp_background": "rgb(28, 27, 34)",
       "ntp_text": "rgb(251, 251, 254)",
       "sidebar": "#38383D",
       "sidebar_text": "rgb(249, 249, 250)",
       "sidebar_border": "rgba(255, 255, 255, 0.1)",
       "button": "rgb(43,42,51)",
       "button_hover": "rgb(82,82,94)",
@@ -59,16 +58,17 @@
       "checkbox_checked_background_hover": "rgb(128, 235, 255)",
       "checkbox_checked_background_active": "rgb(170, 242, 255)",
       "error_text_color": "rgb(255, 154, 162)",
       "input_background": "#42414D",
       "input_color": "#BFBFC9",
       "input_border": "#8f8f9d",
       "input_border_error": "rgb(255, 132, 138)",
       "zoom_controls": "rgb(74,74,85)",
+      "autocomplete_popup_separator": "rgb(82,82,94)",
       "appmenu_update_icon_color": "#54FFBD",
       "appmenu_warning_icon_color": "#FFBD4F",
       "appmenu_info_icon_color": "#80EBFF"
     },
     "properties": {
       "panel_hover": "color-mix(in srgb, currentColor 9%, transparent)",
       "panel_active": "color-mix(in srgb, currentColor 14%, transparent)",
       "panel_active_darker": "color-mix(in srgb, currentColor 25%, transparent)"
@@ -93,16 +93,17 @@
       "checkbox_checked_background_hover": "--checkbox-checked-hover-bgcolor",
       "checkbox_checked_background_active": "--checkbox-checked-active-bgcolor",
       "error_text_color": "--error-text-color",
       "input_background": "--input-bgcolor",
       "input_color": "--input-color",
       "input_border": "--input-border-color",
       "input_border_error": "--input-error-border-color",
       "zoom_controls": "--zoom-controls-bgcolor",
+      "autocomplete_popup_separator": "--autocomplete-popup-separator-color",
       "appmenu_update_icon_color": "--panel-banner-item-update-supported-bgcolor",
       "appmenu_warning_icon_color": "--panel-banner-item-warning-icon-bgcolor",
       "appmenu_info_icon_color": "--panel-banner-item-info-icon-bgcolor"
     },
     "properties": {
       "panel_hover": "--arrowpanel-dimmed",
       "panel_active": "--arrowpanel-dimmed-further",
       "panel_active_darker": "--arrowpanel-dimmed-even-further"