diff --git a/taskcluster/ci/valgrind/kind.yml b/taskcluster/ci/valgrind/kind.yml
index 75d89234c931..b66bfc85a0ac 100644
--- a/taskcluster/ci/valgrind/kind.yml
+++ b/taskcluster/ci/valgrind/kind.yml
@@ -18,14 +18,14 @@ job-defaults:
         retrigger: true
 
 jobs:
-    linux64-valgrind/opt:
-        description: "Linux64 Valgrind Opt"
+    linux64-valgrind-qr/opt-swr:
+        description: "Linux64 Valgrind Opt WebRender"
         index:
             product: firefox
-            job-name: linux64-valgrind-opt
+            job-name: linux64-valgrind-qr/opt-swr
         treeherder:
-            platform: linux64/opt
-            symbol: V
+            platform: linux64-qr/opt
+            symbol: V-swr
             kind: build
             tier: 1
         worker-type: b-linux-aws
@@ -41,6 +41,8 @@ jobs:
             config:
                 - builds/releng_base_firefox.py
                 - builds/releng_base_linux_64_builds.py
+            extra-config:
+                extra_prefs: [gfx.webrender.software=true]
             script: "mozharness/scripts/fx_desktop_build.py"
             secrets: true
             tooltool-downloads: public