diff --git a/testing/awsy/conf/base-prefs.json b/testing/awsy/conf/base-prefs.json
index ab25dc46a930..3a64215949bc 100644
--- a/testing/awsy/conf/base-prefs.json
+++ b/testing/awsy/conf/base-prefs.json
@@ -11,6 +11,5 @@
     "startup.homepage_override_url": "",
     "startup.homepage_welcome_url": "",
     "browser.startup.homepage": "about:blank",
-    "browser.newtabpage.enabled": false,
-    "fission.autostart": true
+    "browser.newtabpage.enabled": false
 }
diff --git a/testing/awsy/conf/prefs.json b/testing/awsy/conf/prefs.json
index 219307628707..09534fd374c7 100644
--- a/testing/awsy/conf/prefs.json
+++ b/testing/awsy/conf/prefs.json
@@ -11,6 +11,5 @@
     "plugin.disable": true,
     "startup.homepage_override_url": "",
     "startup.homepage_welcome_url": "",
-    "trailhead.firstrun.branches": "join",
-    "fission.autostart": true
+    "trailhead.firstrun.branches": "join"
 }
diff --git a/testing/awsy/conf/tp6-prefs.json b/testing/awsy/conf/tp6-prefs.json
index c17795ca7c4c..aa012dce77f6 100644
--- a/testing/awsy/conf/tp6-prefs.json
+++ b/testing/awsy/conf/tp6-prefs.json
@@ -13,6 +13,5 @@
     "plugin.disable": true,
     "startup.homepage_override_url": "",
     "startup.homepage_welcome_url": "",
-    "trailhead.firstrun.branches": "join",
-    "fission.autostart": true
+    "trailhead.firstrun.branches": "join"
 }