diff --git a/devtools/client/styleeditor/StyleEditorUI.sys.mjs b/devtools/client/styleeditor/StyleEditorUI.sys.mjs
index 958482cee4d6..e31bd4bcc17c 100644
--- a/devtools/client/styleeditor/StyleEditorUI.sys.mjs
+++ b/devtools/client/styleeditor/StyleEditorUI.sys.mjs
@@ -1400,6 +1400,10 @@ export class StyleEditorUI extends EventEmitter {
         type.append(this.#panelDoc.createTextNode(`@${rule.type}\u00A0`));
         if (rule.type == "layer" && rule.layerName) {
           type.append(this.#panelDoc.createTextNode(`${rule.layerName}\u00A0`));
+        } else if (rule.type === "property") {
+          type.append(
+            this.#panelDoc.createTextNode(`${rule.propertyName}\u00A0`)
+          );
         }
 
         const cond = this.#panelDoc.createElementNS(HTML_NS, "span");
diff --git a/devtools/client/styleeditor/test/browser_styleeditor_at_rules_sidebar.js b/devtools/client/styleeditor/test/browser_styleeditor_at_rules_sidebar.js
index a0a9bc93fdc3..d106d6780eb1 100644
--- a/devtools/client/styleeditor/test/browser_styleeditor_at_rules_sidebar.js
+++ b/devtools/client/styleeditor/test/browser_styleeditor_at_rules_sidebar.js
@@ -39,6 +39,8 @@ waitForExplicitFinish();
 
 add_task(async function () {
   await pushPref("layout.css.container-queries.enabled", true);
+  // Enable @property rules
+  await pushPref("layout.css.properties-and-values.enabled", true);
 
   const { ui } = await openStyleEditorForURL(TESTCASE_URI);
 
@@ -88,7 +90,7 @@ async function testInlineMediaEditor(ui, editor) {
   is(sidebar.hidden, false, "sidebar is showing on editor with @media");
 
   const entries = sidebar.querySelectorAll(".at-rule-label");
-  is(entries.length, 6, "6 @media rules displayed in sidebar");
+  is(entries.length, 7, "7 at-rules displayed in sidebar");
 
   await testRule({
     ui,
@@ -123,7 +125,6 @@ async function testInlineMediaEditor(ui, editor) {
     ui,
     editor,
     rule: entries[3],
-    conditionText: "",
     line: 16,
     type: "layer",
     layerName: "myLayer",
@@ -146,6 +147,15 @@ async function testInlineMediaEditor(ui, editor) {
     line: 21,
     type: "support",
   });
+
+  await testRule({
+    ui,
+    editor,
+    rule: entries[6],
+    line: 30,
+    type: "property",
+    propertyName: "--my-property",
+  });
 }
 
 async function testMediaEditor(ui, editor) {
@@ -273,27 +283,35 @@ async function testMediaRuleAdded(ui, editor) {
  * @param {StyleEditorUI} options.ui
  * @param {StyleSheetEditor} options.editor: The editor the rule is displayed in
  * @param {Element} options.rule: The rule element in the media sidebar
- * @param {String} options.conditionText: media query condition text
+ * @param {String} options.conditionText: at-rule condition text (for @media, @container, @support)
  * @param {Boolean} options.matches: Whether or not the document matches the rule
  * @param {String} options.layerName: Optional name of the @layer
+ * @param {String} options.propertyName: Name of the @property if type is "property"
  * @param {Number} options.line: Line of the rule
- * @param {String} options.type: The type of the rule (container, layer, media, support ).
+ * @param {String} options.type: The type of the rule (container, layer, media, support, property ).
  *                               Defaults to "media".
  */
 async function testRule({
   ui,
   editor,
   rule,
-  conditionText,
+  conditionText = "",
   matches,
   layerName,
+  propertyName,
   line,
   type = "media",
 }) {
   const atTypeEl = rule.querySelector(".at-rule-type");
+  let name;
+  if (type === "layer") {
+    name = layerName;
+  } else if (type === "property") {
+    name = propertyName;
+  }
   is(
     atTypeEl.textContent,
-    `@${type}\u00A0${layerName ? `${layerName}\u00A0` : ""}`,
+    `@${type}\u00A0${name ? `${name}\u00A0` : ""}`,
     "label for at-rule type is correct"
   );
 
diff --git a/devtools/client/styleeditor/test/media-rules.html b/devtools/client/styleeditor/test/media-rules.html
index 76725bfb5414..1e855aa83bf8 100644
--- a/devtools/client/styleeditor/test/media-rules.html
+++ b/devtools/client/styleeditor/test/media-rules.html
@@ -38,6 +38,12 @@
         }
       }
     }
+
+    @property --my-property {
+      syntax: "<color>";
+      inherits: true;
+      initial-value: #f06;
+    }
   </style>
 </head>
 <body>
diff --git a/devtools/server/actors/utils/stylesheets-manager.js b/devtools/server/actors/utils/stylesheets-manager.js
index a9c0705e8db9..30533ecd08af 100644
--- a/devtools/server/actors/utils/stylesheets-manager.js
+++ b/devtools/server/actors/utils/stylesheets-manager.js
@@ -705,6 +705,13 @@ class StyleSheetsManager extends EventEmitter {
           line: InspectorUtils.getRelativeRuleLine(rule),
           column: InspectorUtils.getRuleColumn(rule),
         });
+      } else if (className === "CSSPropertyRule") {
+        atRules.push({
+          type: "property",
+          propertyName: rule.name,
+          line: InspectorUtils.getRelativeRuleLine(rule),
+          column: InspectorUtils.getRuleColumn(rule),
+        });
       }
     }
     return {
diff --git a/devtools/shared/commands/resource/tests/browser_resources_stylesheets.js b/devtools/shared/commands/resource/tests/browser_resources_stylesheets.js
index ec81e8118de6..6c4f2e867a46 100644
--- a/devtools/shared/commands/resource/tests/browser_resources_stylesheets.js
+++ b/devtools/shared/commands/resource/tests/browser_resources_stylesheets.js
@@ -118,6 +118,8 @@ const ADDITIONAL_FROM_ACTOR_RESOURCE = {
 };
 
 add_task(async function () {
+  // Enable @property
+  await pushPref("layout.css.properties-and-values.enabled", true);
   await testResourceAvailableDestroyedFeature();
   await testResourceUpdateFeature();
   await testNestedResourceUpdateFeature();
@@ -496,13 +498,18 @@ async function testNestedResourceUpdateFeature() {
           }
         }
       }
+    }
+    @property --my-property {
+      syntax: "<color>";
+      inherits: true;
+      initial-value: #f06;
     }`,
     false
   );
   await waitUntil(() => updates.length === 3);
   is(
     updates.at(-1).resource.ruleCount,
-    7,
+    8,
     "Resource in update has expected ruleCount"
   );
 
@@ -554,6 +561,10 @@ async function testNestedResourceUpdateFeature() {
       type: "container",
       conditionText: "root (width > 10px)",
     },
+    {
+      type: "property",
+      propertyName: "--my-property",
+    },
   ];
 
   assertAtRules(targetUpdate.resource.atRules, expectedAtRules);
@@ -562,7 +573,7 @@ async function testNestedResourceUpdateFeature() {
   const styleSheetResult = await getStyleSheetResult(tab);
   is(
     styleSheetResult.ruleCount,
-    7,
+    8,
     "ruleCount of actual stylesheet is updated correctly"
   );
   assertAtRules(styleSheetResult.atRules, expectedAtRules);
@@ -620,6 +631,11 @@ async function getStyleSheetResult(tab) {
             type: "support",
             conditionText: rule.conditionText,
           });
+        } else if (rule instanceof content.CSSPropertyRule) {
+          atRules.push({
+            type: "property",
+            propertyName: rule.name,
+          });
         }
 
         if (rule.cssRules) {
@@ -655,6 +671,8 @@ function assertAtRules(atRules, expectedAtRules) {
       is(atRule.matches, expected.matches, "matches is correct");
     } else if (expected.type === "layer") {
       is(atRule.layerName, expected.layerName, "layerName is correct");
+    } else if (expected.type === "property") {
+      is(atRule.propertyName, expected.propertyName, "propertyName is correct");
     }
 
     if (expected.line !== undefined) {
diff --git a/layout/inspector/InspectorUtils.cpp b/layout/inspector/InspectorUtils.cpp
index 80b93029e542..0b2138e9fc1b 100644
--- a/layout/inspector/InspectorUtils.cpp
+++ b/layout/inspector/InspectorUtils.cpp
@@ -415,6 +415,7 @@ static uint32_t CollectAtRules(ServoCSSRuleList& aRuleList,
       case StyleCssRuleType::Media:
       case StyleCssRuleType::Supports:
       case StyleCssRuleType::LayerBlock:
+      case StyleCssRuleType::Property:
       case StyleCssRuleType::Container: {
         Unused << aResult.AppendElement(OwningNonNull(*rule), fallible);
         break;
@@ -425,7 +426,6 @@ static uint32_t CollectAtRules(ServoCSSRuleList& aRuleList,
       case StyleCssRuleType::LayerStatement:
       case StyleCssRuleType::FontFace:
       case StyleCssRuleType::Page:
-      case StyleCssRuleType::Property:
       case StyleCssRuleType::Keyframes:
       case StyleCssRuleType::Keyframe:
       case StyleCssRuleType::Margin: