diff --git a/tests/browser/playwright.config.mjs b/tests/browser/playwright.config.mjs
index e2b1268ad..ad11dbc6f 100644
--- a/tests/browser/playwright.config.mjs
+++ b/tests/browser/playwright.config.mjs
@@ -43,6 +43,7 @@ export default defineConfig({
       use: { browserName },
       testIgnore: measurementFiles,
       dependencies: ["webkit-measurements"],
+      fullyParallel: true,
     })),
   ],
 });
diff --git a/tests/integration/browser-ci.test.mjs b/tests/integration/browser-ci.test.mjs
index f3c15dbdb..527fb47d1 100644
--- a/tests/integration/browser-ci.test.mjs
+++ b/tests/integration/browser-ci.test.mjs
@@ -79,11 +79,15 @@ test("four independent browser jobs retain isolated measurements and native setu
   );
   assert.equal(projects["chromium-measurements"].workers, 1);
   assert.equal(projects["webkit-measurements"].workers, 1);
+  assert.ok(!projects["chromium-measurements"].fullyParallel);
+  assert.ok(!projects["webkit-measurements"].fullyParallel);
   assert.deepEqual(projects["webkit-measurements"].dependencies, [
     "chromium-measurements",
   ]);
-  for (const engine of ["chromium", "webkit"])
+  for (const engine of ["chromium", "webkit"]) {
     assert.deepEqual(projects[engine].dependencies, ["webkit-measurements"]);
+    assert.equal(projects[engine].fullyParallel, true);
+  }
 });
 
 test("workflow shards discover every functional test/project exactly once", (t) => {