diff --git a/tests/wpt/harness/wptrunner/executors/executorservo.py b/tests/wpt/harness/wptrunner/executors/executorservo.py
index 1172a97358f..b0e0eaeda27 100644
--- a/tests/wpt/harness/wptrunner/executors/executorservo.py
+++ b/tests/wpt/harness/wptrunner/executors/executorservo.py
@@ -65,10 +65,6 @@ class ServoTestharnessExecutor(ProcessTestExecutor):
         args = ["--cpu", "--hard-fail", "-u", "Servo/wptrunner", "-z", self.test_url(test)]
         for stylesheet in self.browser.user_stylesheets:
             args += ["--user-stylesheet", stylesheet]
-
-        for pref in test.environment.get('prefs', {}):
-            args += ["--pref", pref]
-
         debug_args, command = browser_command(self.binary, args, self.debug_info)
 
         self.command = command
@@ -199,8 +195,6 @@ class ServoRefTestExecutor(ProcessTestExecutor):
                             "--output=%s" % output_path, full_url]
             for stylesheet in self.browser.user_stylesheets:
                 self.command += ["--user-stylesheet", stylesheet]
-            for pref in test.environment.get('prefs', {}):
-                self.command += ["--pref", pref]
 
             env = os.environ.copy()
             env["HOST_FILE"] = self.hosts_path
diff --git a/tests/wpt/metadata-css/__dir__.ini b/tests/wpt/metadata-css/__dir__.ini
deleted file mode 100644
index ac9f35f358b..00000000000
--- a/tests/wpt/metadata-css/__dir__.ini
+++ /dev/null
@@ -1,9 +0,0 @@
-prefs: ["layout.flex.enabled:true",
-        "layout.flex-direction.enabled:true",
-        "layout.columns.enabled:true",
-        "layout.column-width.enabled:true",
-        "layout.column-count.enabled:true",
-        "layout.column-gap.enabled:true",
-        "layout.writing-mode.enabled:true",
-        "layout.text-orientation.enabled:true",
-        "layout.viewport.enabled:true"]