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diff --git a/devtools/client/shared/redux/middleware/history.js b/devtools/client/shared/redux/middleware/history.js
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+/* 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 flags = require("devtools/shared/flags");
+
+/**
+ * A middleware that stores every action coming through the store in the passed
+ * in logging object. Should only be used for tests, as it collects all
+ * action information, which will cause memory bloat.
+ */
+exports.history = (log = []) => ({ dispatch, getState }) => {
+ if (!flags.testing) {
+ console.warn("Using history middleware stores all actions in state for " +
+ "testing and devtools is not currently running in test " +
+ "mode. Be sure this is intentional.");
+ }
+ return next => action => {
+ log.push(action);
+ next(action);
+ };
+};