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diff --git a/devtools/client/animationinspector/test/browser_animation_timeline_rate_selector.js b/devtools/client/animationinspector/test/browser_animation_timeline_rate_selector.js
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+++ b/devtools/client/animationinspector/test/browser_animation_timeline_rate_selector.js
@@ -0,0 +1,56 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+requestLongerTimeout(2);
+
+// Check that the timeline toolbar contains a playback rate selector UI and that
+// it can be used to change the playback rate of animations in the timeline.
+// Also check that it displays the rate of the current animations in case they
+// all have the same rate, or that it displays the empty value in case they
+// have mixed rates.
+
+add_task(function* () {
+  yield addTab(URL_ROOT + "doc_simple_animation.html");
+
+  let {panel, controller, inspector, toolbox} = yield openAnimationInspector();
+
+  // In this test, we disable the highlighter on purpose because of the way
+  // events are simulated to select an option in the playbackRate <select>.
+  // Indeed, this may cause mousemove events to be triggered on the nodes that
+  // are underneath the <select>, and these are AnimationTargetNode instances.
+  // Simulating mouse events on them will cause the highlighter to emit requests
+  // and this might cause the test to fail if they happen after it has ended.
+  disableHighlighter(toolbox);
+
+  let select = panel.rateSelectorEl.firstChild;
+
+  ok(select, "The rate selector exists");
+
+  info("Change all of the current animations' rates to 0.5");
+  yield changeTimelinePlaybackRate(panel, .5);
+  checkAllAnimationsRatesChanged(controller, select, .5);
+
+  info("Select just one animated node and change its rate only");
+  yield selectNodeAndWaitForAnimations(".animated", inspector);
+
+  yield changeTimelinePlaybackRate(panel, 2);
+  checkAllAnimationsRatesChanged(controller, select, 2);
+
+  info("Select the <body> again, it should now have mixed-rates animations");
+  yield selectNodeAndWaitForAnimations("body", inspector);
+
+  is(select.value, "", "The selected rate is empty");
+
+  info("Change the rate for these mixed-rate animations");
+  yield changeTimelinePlaybackRate(panel, 1);
+  checkAllAnimationsRatesChanged(controller, select, 1);
+});
+
+function checkAllAnimationsRatesChanged({animationPlayers}, select, rate) {
+  ok(animationPlayers.every(({state}) => state.playbackRate === rate),
+     "All animations' rates have been set to " + rate);
+  is(select.value, rate, "The right value is displayed in the select");
+}