diff --git a/testing/web-platform/meta/MANIFEST.json b/testing/web-platform/meta/MANIFEST.json
index e5fff234139d0..ad17d431b1a4a 100644
--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -646271,7 +646271,7 @@
    "support"
   ],
   "tools/ci/check_stability.py": [
-   "684f7a518940c4ce63fc3360eddb53382f040370",
+   "2b32eb50c0f62448fed0417d1fe0f7882bf64f14",
    "support"
   ],
   "tools/ci/ci_built_diff.sh": [
diff --git a/testing/web-platform/tests/tools/ci/check_stability.py b/testing/web-platform/tests/tools/ci/check_stability.py
index 684f7a518940c..2b32eb50c0f62 100644
--- a/testing/web-platform/tests/tools/ci/check_stability.py
+++ b/testing/web-platform/tests/tools/ci/check_stability.py
@@ -266,8 +266,7 @@ def run(venv, wpt_args, **kwargs):
         do_delayed_imports()
 
         wpt_kwargs["prompt"] = False
-        wpt_kwargs["install_browser"] = True
-        wpt_kwargs["install"] = wpt_kwargs["product"].split(":")[0] == "firefox"
+        wpt_kwargs["install_browser"] = wpt_kwargs["product"].split(":")[0] == "firefox"
 
         wpt_kwargs["pause_after_test"] = False
         wpt_kwargs["verify_log_full"] = False