--- a/browser/components/extensions/schemas/tabs.json
+++ b/browser/components/extensions/schemas/tabs.json
@@ -56,17 +56,17 @@
         "id": "Tab",
         "type": "object",
         "properties": {
           "id": {"type": "integer", "minimum": -1, "optional": true, "description": "The ID of the tab. Tab IDs are unique within a browser session. Under some circumstances a Tab may not be assigned an ID, for example when querying foreign tabs using the $(ref:sessions) API, in which case a session ID may be present. Tab ID can also be set to $(ref:tabs.TAB_ID_NONE) for apps and devtools windows."},
           "index": {"type": "integer", "minimum": -1, "description": "The zero-based index of the tab within its window."},
           "windowId": {"type": "integer", "minimum": 0, "description": "The ID of the window the tab is contained within."},
           "openerTabId": {"unsupported": true, "type": "integer", "minimum": 0, "optional": true, "description": "The ID of the tab that opened this tab, if any. This property is only present if the opener tab still exists."},
           "selected": {"type": "boolean", "description": "Whether the tab is selected.", "deprecated": "Please use $(ref:tabs.Tab.highlighted).", "unsupported": true},
-          "highlighted": {"type": "boolean", "description": "Whether the tab is highlighted."},
+          "highlighted": {"type": "boolean", "description": "Whether the tab is highlighted. Works as an alias of active"},
           "active": {"type": "boolean", "description": "Whether the tab is active in its window. (Does not necessarily mean the window is focused.)"},
           "pinned": {"type": "boolean", "description": "Whether the tab is pinned."},
           "audible": {"type": "boolean", "optional": true, "description": "Whether the tab has produced sound over the past couple of seconds (but it might not be heard if also muted). Equivalent to whether the speaker audio indicator is showing."},
           "mutedInfo": {"$ref": "MutedInfo", "optional": true, "description": "Current tab muted state and the reason for the last state change."},
           "url": {"type": "string", "optional": true, "permissions": ["tabs"], "description": "The URL the tab is displaying. This property is only present if the extension's manifest includes the <code>\"tabs\"</code> permission."},
           "title": {"type": "string", "optional": true, "permissions": ["tabs"], "description": "The title of the tab. This property is only present if the extension's manifest includes the <code>\"tabs\"</code> permission."},
           "favIconUrl": {"type": "string", "optional": true, "permissions": ["tabs"], "description": "The URL of the tab's favicon. This property is only present if the extension's manifest includes the <code>\"tabs\"</code> permission. It may also be an empty string if the tab is loading."},
           "status": {"type": "string", "optional": true, "description": "Either <em>loading</em> or <em>complete</em>."},
@@ -469,17 +469,17 @@
               "muted": {
                 "type": "boolean",
                 "optional": true,
                 "description": "Whether the tabs are muted."
               },
               "highlighted": {
                 "type": "boolean",
                 "optional": true,
-                "description": "Whether the tabs are highlighted."
+                "description": "Whether the tabs are highlighted.  Works as an alias of active."
               },
               "currentWindow": {
                 "type": "boolean",
                 "optional": true,
                 "description": "Whether the tabs are in the $(topic:current-window)[current window]."
               },
               "lastFocusedWindow": {
                 "type": "boolean",
@@ -543,16 +543,17 @@
           }
         ]
       },
       {
         "name": "highlight",
         "type": "function",
         "description": "Highlights the given tabs.",
         "async": "callback",
+        "unsupported": "true",
         "parameters": [
           {
             "type": "object",
             "name": "highlightInfo",
             "properties": {
                "windowId": {
                  "type": "integer",
                  "optional": true,

--- a/browser/components/extensions/test/mochitest/test_ext_all_apis.html
+++ b/browser/components/extensions/test/mochitest/test_ext_all_apis.html
@@ -26,17 +26,16 @@ let expectedBackgroundApisTargetSpecific
   "tabs.create",
   "tabs.detectLanguage",
   "tabs.duplicate",
   "tabs.executeScript",
   "tabs.get",
   "tabs.getCurrent",
   "tabs.getZoom",
   "tabs.getZoomSettings",
-  "tabs.highlight",
   "tabs.insertCSS",
   "tabs.move",
   "tabs.onActivated",
   "tabs.onAttached",
   "tabs.onCreated",
   "tabs.onDetached",
   "tabs.onHighlighted",
   "tabs.onMoved",

--- a/mobile/android/components/extensions/schemas/tabs.json
+++ b/mobile/android/components/extensions/schemas/tabs.json
@@ -56,17 +56,17 @@
         "id": "Tab",
         "type": "object",
         "properties": {
           "id": {"type": "integer", "minimum": -1, "optional": true, "description": "The ID of the tab. Tab IDs are unique within a browser session. Under some circumstances a Tab may not be assigned an ID, for example when querying foreign tabs using the $(ref:sessions) API, in which case a session ID may be present. Tab ID can also be set to $(ref:tabs.TAB_ID_NONE) for apps and devtools windows."},
           "index": {"type": "integer", "minimum": -1, "description": "The zero-based index of the tab within its window."},
           "windowId": {"type": "integer", "minimum": 0, "description": "The ID of the window the tab is contained within."},
           "openerTabId": {"unsupported": true, "type": "integer", "minimum": 0, "optional": true, "description": "The ID of the tab that opened this tab, if any. This property is only present if the opener tab still exists."},
           "selected": {"type": "boolean", "description": "Whether the tab is selected.", "deprecated": "Please use $(ref:tabs.Tab.highlighted).", "unsupported": true},
-          "highlighted": {"type": "boolean", "description": "Whether the tab is highlighted."},
+          "highlighted": {"type": "boolean", "description": "Whether the tab is highlighted. Works as an alias of active."},
           "active": {"type": "boolean", "description": "Whether the tab is active in its window. (Does not necessarily mean the window is focused.)"},
           "pinned": {"type": "boolean", "description": "Whether the tab is pinned."},
           "audible": {"type": "boolean", "optional": true, "description": "Whether the tab has produced sound over the past couple of seconds (but it might not be heard if also muted). Equivalent to whether the speaker audio indicator is showing."},
           "mutedInfo": {"$ref": "MutedInfo", "optional": true, "description": "Current tab muted state and the reason for the last state change."},
           "url": {"type": "string", "optional": true, "permissions": ["tabs"], "description": "The URL the tab is displaying. This property is only present if the extension's manifest includes the <code>\"tabs\"</code> permission."},
           "title": {"type": "string", "optional": true, "permissions": ["tabs"], "description": "The title of the tab. This property is only present if the extension's manifest includes the <code>\"tabs\"</code> permission."},
           "favIconUrl": {"type": "string", "optional": true, "permissions": ["tabs"], "description": "The URL of the tab's favicon. This property is only present if the extension's manifest includes the <code>\"tabs\"</code> permission. It may also be an empty string if the tab is loading."},
           "status": {"type": "string", "optional": true, "description": "Either <em>loading</em> or <em>complete</em>."},
@@ -470,17 +470,17 @@
               "muted": {
                 "type": "boolean",
                 "optional": true,
                 "description": "Whether the tabs are muted."
               },
               "highlighted": {
                 "type": "boolean",
                 "optional": true,
-                "description": "Whether the tabs are highlighted."
+                "description": "Whether the tabs are highlighted. Works as an alias of active."
               },
               "currentWindow": {
                 "type": "boolean",
                 "optional": true,
                 "description": "Whether the tabs are in the $(topic:current-window)[current window]."
               },
               "lastFocusedWindow": {
                 "type": "boolean",
@@ -544,16 +544,17 @@
           }
         ]
       },
       {
         "name": "highlight",
         "type": "function",
         "description": "Highlights the given tabs.",
         "async": "callback",
+        "unsupported": true,
         "parameters": [
           {
             "type": "object",
             "name": "highlightInfo",
             "properties": {
                "windowId": {
                  "type": "integer",
                  "optional": true,

--- a/mobile/android/components/extensions/test/mochitest/test_ext_all_apis.html
+++ b/mobile/android/components/extensions/test/mochitest/test_ext_all_apis.html
@@ -22,17 +22,16 @@ let expectedBackgroundApisTargetSpecific
   "tabs.WindowType",
   "tabs.ZoomSettingsMode",
   "tabs.ZoomSettingsScope",
   "tabs.connect",
   "tabs.create",
   "tabs.executeScript",
   "tabs.get",
   "tabs.getCurrent",
-  "tabs.highlight",
   "tabs.insertCSS",
   "tabs.onActivated",
   "tabs.onAttached",
   "tabs.onCreated",
   "tabs.onDetached",
   "tabs.onHighlighted",
   "tabs.onMoved",
   "tabs.onRemoved",