--- a/taskcluster/ci/test/awsy.yml
+++ b/taskcluster/ci/test/awsy.yml
@@ -60,28 +60,21 @@ awsy-dmd:
         extra-options:
             - --dmd
 
 awsy-base:
     description: Are we slim yet - about:blank base case
     variants: [fission]
     treeherder-symbol: SY(ab)
     run-on-projects:
-        by-variant:
-            fission:
-                by-test-platform:
-                    .*-devedition/.*: []  # don't run on devedition
-                    windows.*-32.*/opt: []
-                    (linux|windows10-64-2004|mac)(?!.*shippable).*/opt: []
-                    default: [integration, mozilla-central, mozilla-beta, mozilla-release]
-            default:
-                by-test-platform:
-                    linux1804-64-shippable-qr/opt: [mozilla-central]
-                    windows10-64-2004-shippable-qr/opt: [mozilla-central]
-                    default: []
+        by-test-platform:
+            .*-devedition/.*: []  # don't run on devedition.
+            windows.*-32.*/opt: []
+            (linux|windows10-64-2004|mac)(?!.*shippable).*/opt: []
+            default: [integration, mozilla-central, mozilla-beta, mozilla-release]
     tier: default
     mozharness:
         extra-options:
             - --base
 
 awsy-base-dmd:
     description: Are we slim yet - about:blank base case - dmd enabled
     treeherder-symbol: SY(ab-d)