diff --git a/devtools/client/shared/test-helpers/jest-fixtures/indexed-db.js b/devtools/client/shared/test-helpers/jest-fixtures/indexed-db.js
new file mode 100644
index 000000000000..32bb957a65e1
--- /dev/null
+++ b/devtools/client/shared/test-helpers/jest-fixtures/indexed-db.js
@@ -0,0 +1,15 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+"use strict";
+
+const store = {};
+
+module.exports = {
+  open: () => ({}),
+  getItem: async key => store[key],
+  setItem: async (key, value) => {
+    store[key] = value;
+  },
+};
diff --git a/devtools/client/shared/test-helpers/shared-jest.config.js b/devtools/client/shared/test-helpers/shared-jest.config.js
index ecd6c807adaf..504a347cf4bd 100644
--- a/devtools/client/shared/test-helpers/shared-jest.config.js
+++ b/devtools/client/shared/test-helpers/shared-jest.config.js
@@ -33,6 +33,7 @@ module.exports = {
     // Sometimes returning an empty object is enough
     "^resource://devtools/client/shared/link": `${fixturesDir}/empty-module`,
     "^devtools/shared/flags": `${fixturesDir}/empty-module`,
+    "^resource://devtools/shared/indexed-db.js": `${fixturesDir}/indexed-db`,
     "^devtools/shared/layout/utils": `${fixturesDir}/empty-module`,
     "^devtools/client/shared/components/tree/TreeView": `${fixturesDir}/empty-module`,
     // Map all require("devtools/...") to the real devtools root.
diff --git a/devtools/client/shared/test-helpers/shared-node-helpers.js b/devtools/client/shared/test-helpers/shared-node-helpers.js
index 5fd686bf66f5..0b202f263abb 100644
--- a/devtools/client/shared/test-helpers/shared-node-helpers.js
+++ b/devtools/client/shared/test-helpers/shared-node-helpers.js
@@ -46,10 +46,6 @@ function setMocksInGlobal() {
 
   global.loader = {
     lazyGetter: (context, name, fn) => {
-      if (global.hasOwnProperty(name)) {
-        return;
-      }
-
       Object.defineProperty(global, name, {
         get() {
           delete global[name];
@@ -119,15 +115,6 @@ function setMocksInGlobal() {
     };
   }
 
-  const store = {};
-  global.indexedDB = {
-    open: () => ({}),
-    getItem: async key => store[key],
-    setItem: async (key, value) => {
-      store[key] = value;
-    },
-  };
-
   if (typeof global.TextEncoder === "undefined") {
     const { TextEncoder } = require("util");
     global.TextEncoder = TextEncoder;
diff --git a/devtools/shared/indexed-db.js b/devtools/shared/indexed-db.js
index a4ea57c76f5c..25cb858142b4 100644
--- a/devtools/shared/indexed-db.js
+++ b/devtools/shared/indexed-db.js
@@ -9,46 +9,41 @@
  * a principal dedicated to DevTools.
  */
 
-// When running in jest, we can't use Cu.Sandbox and only expose the native indexedDB object
-if (globalThis.indexedDB) {
-  module.exports = globalThis.indexedDB;
-} else {
-  const PSEUDOURI = "indexeddb://fx-devtools";
-  const principaluri = Services.io.newURI(PSEUDOURI);
-  const principal = Services.scriptSecurityManager.createContentPrincipal(
-    principaluri,
-    {}
-  );
+const PSEUDOURI = "indexeddb://fx-devtools";
+const principaluri = Services.io.newURI(PSEUDOURI);
+const principal = Services.scriptSecurityManager.createContentPrincipal(
+  principaluri,
+  {}
+);
 
-  // indexedDB is only exposed to document globals.
-  // We are retrieving an instance from a Sandbox, which has to be loaded
-  // from the system principal in order to avoid having wrappers around
-  // all indexed DB objects.
-  const systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
-  const sandbox = Cu.Sandbox(systemPrincipal, {
-    wantGlobalProperties: ["indexedDB"],
-  });
-  const { indexedDB } = sandbox;
+// indexedDB is only exposed to document globals.
+// We are retrieving an instance from a Sandbox, which has to be loaded
+// from the system principal in order to avoid having wrappers around
+// all indexed DB objects.
+const systemPrincipal = Services.scriptSecurityManager.getSystemPrincipal();
+const sandbox = Cu.Sandbox(systemPrincipal, {
+  wantGlobalProperties: ["indexedDB"],
+});
+const { indexedDB } = sandbox;
 
-  module.exports = Object.freeze({
-    /**
-     * Only the standard version of indexedDB.open is supported.
-     */
-    open(name, version) {
-      const options = {};
-      if (typeof version === "number") {
-        options.version = version;
-      }
-      return indexedDB.openForPrincipal(principal, name, options);
-    },
+module.exports = Object.freeze({
+  /**
+   * Only the standard version of indexedDB.open is supported.
+   */
+  open(name, version) {
+    const options = {};
+    if (typeof version === "number") {
+      options.version = version;
+    }
+    return indexedDB.openForPrincipal(principal, name, options);
+  },
 
-    /**
-     * Only the standard version of indexedDB.deleteDatabase is supported.
-     */
-    deleteDatabase(name) {
-      return indexedDB.deleteForPrincipal(principal, name);
-    },
+  /**
+   * Only the standard version of indexedDB.deleteDatabase is supported.
+   */
+  deleteDatabase(name) {
+    return indexedDB.deleteForPrincipal(principal, name);
+  },
 
-    cmp: indexedDB.cmp.bind(indexedDB),
-  });
-}
+  cmp: indexedDB.cmp.bind(indexedDB),
+});