diff --git a/taskcluster/config.yml b/taskcluster/config.yml
index b7adb61..8da8456 100644
--- a/taskcluster/config.yml
+++ b/taskcluster/config.yml
@@ -169,7 +169,7 @@ workers:
             worker-type:
                 by-level:
                     "3": xpi-3-signing
-                    default: xpi-t-signing
+                    default: xpi-t-signing-dev
         shipit:
             provisioner: scriptworker-k8s
             implementation: scriptworker-shipit
@@ -185,11 +185,11 @@ scriptworker:
     scope-prefix: project:xpi:releng
     signing-format:
         by-xpi-type:
-            mozillaonline-privileged: privileged_webextension
-            privileged: privileged_webextension
-            system: system_addon
+            mozillaonline-privileged: stage_privileged_webextension
+            privileged: stage_privileged_webextension
+            system: stage_system_addon
             # normandy-privileged is deprecated
-            normandy-privileged: privileged_webextension
+            normandy-privileged: stage_privileged_webextension
 
 release-promotion:
     flavors:
diff --git a/taskcluster/xpi_taskgraph/transforms/signing.py b/taskcluster/xpi_taskgraph/transforms/signing.py
index 255f66e..3c5a7cf 100644
--- a/taskcluster/xpi_taskgraph/transforms/signing.py
+++ b/taskcluster/xpi_taskgraph/transforms/signing.py
@@ -13,7 +13,7 @@
 
 transforms = TransformSequence()
 
-KNOWN_FORMATS = ("privileged_webextension", "system_addon")
+KNOWN_FORMATS = ("privileged_webextension", "system_addon", "stage_privileged_webextension", "stage_system_addon")
 
 
 @transforms.add