--- a/devtools/server/tests/browser/browser_animation_emitMutations.js
+++ b/devtools/server/tests/browser/browser_animation_emitMutations.js
@@ -25,20 +25,20 @@ add_task(function*() {
   yield node.modifyAttributes([
     {attributeName: "class", newValue: "multiple-animations"}
   ]);
   let changes = yield onMutations;
 
   ok(true, "The mutations event was emitted");
   is(changes.length, 2, "There are 2 changes in the mutation event");
   ok(changes.every(({type}) => type === "added"), "Both changes are additions");
-  is(changes[0].player.initialState.name, "move",
-    "The first added animation is 'move'");
-  is(changes[1].player.initialState.name, "glow",
-    "The first added animation is 'glow'");
+
+  let names = changes.map(c => c.player.initialState.name).sort();
+  is(names[0], "glow", "The animation 'glow' was added");
+  is(names[1], "move", "The animation 'move' was added");
 
   info("Store the 2 new players for comparing later");
   let p1 = changes[0].player;
   let p2 = changes[1].player;
 
   info("Listen for removed animations");
   onMutations = once(animations, "mutations");