--- a/testing/taskcluster/tasks/tests/fx_linux64_firefox_ui_functional.yml
+++ b/testing/taskcluster/tasks/tests/fx_linux64_firefox_ui_functional.yml
@@ -19,9 +19,9 @@ task:
   extra:
     suite:
       name: firefox-ui
       flavor: functional
     treeherder:
       groupName: Desktop firefox-ui-tests
       groupSymbol: tc-Fxfn
       symbol: en-US
-      tier: 3
+      tier: 2

--- a/testing/taskcluster/tasks/tests/fx_linux64_firefox_ui_functional_e10s.yml
+++ b/testing/taskcluster/tasks/tests/fx_linux64_firefox_ui_functional_e10s.yml
@@ -20,9 +20,9 @@ task:
   extra:
     suite:
       name: firefox-ui
       flavor: functional
     treeherder:
       groupName: Desktop firefox-ui-tests
       groupSymbol: tc-Fxfn-e10s
       symbol: en-US
-      tier: 3
+      tier: 2