diff --git a/testing/talos/talos.json b/testing/talos/talos.json
index db32ed72b12c..5388489a5ad0 100644
--- a/testing/talos/talos.json
+++ b/testing/talos/talos.json
@@ -46,10 +46,7 @@
             "benchmark_zip": "jetstream.zip"
         },
         "svgr": {
-            "tests": ["tsvgx", "tsvgr_opacity", "tscrollx", "tsvg_static"]
-        },
-        "svgr_disabled_see_bug1651311": {
-            "tests": ["tart"]
+            "tests": ["tsvgx", "tsvgr_opacity", "tscrollx", "tsvg_static", "tart"]
         },
         "perf-reftest": {
             "tests": ["perf_reftest"]
diff --git a/testing/talos/talos/tests/tart/addon/api.js b/testing/talos/talos/tests/tart/addon/api.js
index 69b0d36e0f6b..892394d40009 100644
--- a/testing/talos/talos/tests/tart/addon/api.js
+++ b/testing/talos/talos/tests/tart/addon/api.js
@@ -85,7 +85,9 @@ this.tart = class extends ExtensionAPI {
         break;
 
       case "runTest":
-        new win.Tart().startTest(sendResult, command.data);
+        win.gBrowserInit.idleTasksFinishedPromise.then(() => {
+          new win.Tart().startTest(sendResult, command.data);
+        });
         break;
 
       case "setASAP":