diff --git a/browser/components/extensions/test/browser/browser-common.ini b/browser/components/extensions/test/browser/browser-common.ini
index bc6983de3c78..8924206e4b68 100644
--- a/browser/components/extensions/test/browser/browser-common.ini
+++ b/browser/components/extensions/test/browser/browser-common.ini
@@ -39,6 +39,7 @@ support-files =
   ../../../../../toolkit/components/reader/test/readerModeArticle.html
 
 [browser_ext_browserAction_area.js]
+[browser_ext_browserAction_experiment.js]
 [browser_ext_browserAction_context.js]
 skip-if = os == 'win' || os == 'mac' # Bug 1405453
 [browser_ext_browserAction_contextMenu.js]
diff --git a/browser/components/extensions/test/browser/browser_ext_browserAction_experiment.js b/browser/components/extensions/test/browser/browser_ext_browserAction_experiment.js
new file mode 100644
index 000000000000..ea0ca6f8eee8
--- /dev/null
+++ b/browser/components/extensions/test/browser/browser_ext_browserAction_experiment.js
@@ -0,0 +1,137 @@
+/* -*- Mode: indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set sts=2 sw=2 et tw=80: */
+"use strict";
+
+let fooExperimentAPIs = {
+  foo: {
+    schema: "schema.json",
+    parent: {
+      scopes: ["addon_parent"],
+      script: "parent.js",
+      paths: [["experiments", "foo", "parent"]],
+    },
+    child: {
+      scopes: ["addon_child"],
+      script: "child.js",
+      paths: [["experiments", "foo", "child"]],
+    },
+  },
+};
+
+let fooExperimentFiles = {
+  "schema.json": JSON.stringify([
+    {
+      "namespace": "experiments.foo",
+      "types": [
+        {
+          "id": "Meh",
+          "type": "object",
+          "properties": {},
+        },
+      ],
+      "functions": [
+        {
+          "name": "parent",
+          "type": "function",
+          "async": true,
+          "parameters": [],
+        },
+        {
+          "name": "child",
+          "type": "function",
+          "parameters": [],
+          "returns": {"type": "string"},
+        },
+      ],
+    },
+  ]),
+
+  /* globals ExtensionAPI */
+  "parent.js": () => {
+    this.foo = class extends ExtensionAPI {
+      getAPI(context) {
+        return {
+          experiments: {
+            foo: {
+              parent() {
+                return Promise.resolve("parent");
+              },
+            },
+          },
+        };
+      }
+    };
+  },
+
+  "child.js": () => {
+    this.foo = class extends ExtensionAPI {
+      getAPI(context) {
+        return {
+          experiments: {
+            foo: {
+              child() {
+                return "child";
+              },
+            },
+          },
+        };
+      }
+    };
+  },
+};
+
+async function testFooExperiment() {
+  browser.test.assertEq("object", typeof browser.experiments,
+                        "typeof browser.experiments");
+
+  browser.test.assertEq("object", typeof browser.experiments.foo,
+                        "typeof browser.experiments.foo");
+
+  browser.test.assertEq("function", typeof browser.experiments.foo.child,
+                        "typeof browser.experiments.foo.child");
+
+  browser.test.assertEq("function", typeof browser.experiments.foo.parent,
+                        "typeof browser.experiments.foo.parent");
+
+  browser.test.assertEq("child", browser.experiments.foo.child(),
+                        "foo.child()");
+
+  browser.test.assertEq("parent", await browser.experiments.foo.parent(),
+                        "await foo.parent()");
+}
+
+add_task(async function test_browseraction_with_experiment() {
+  async function background() {
+    await new Promise(resolve => browser.browserAction.onClicked.addListener(resolve));
+    browser.test.log("Got browserAction.onClicked");
+
+    await testFooExperiment();
+
+    browser.test.notifyPass("background-browserAction-experiments.foo");
+  }
+
+  let extension = ExtensionTestUtils.loadExtension({
+    isPrivileged: true,
+
+    manifest: {
+      browser_action: {},
+
+      experiment_apis: fooExperimentAPIs,
+    },
+
+    background: `
+      ${testFooExperiment}
+      (${background})();
+    `,
+
+    files: fooExperimentFiles,
+  });
+
+  await extension.startup();
+
+  await clickBrowserAction(extension, window);
+
+  await extension.awaitFinish("background-browserAction-experiments.foo");
+
+  await extension.unload();
+});