diff --git a/browser/components/uitour/test/browser.ini b/browser/components/uitour/test/browser.ini
index 178646b1c10f..3c18cdde01b0 100644
--- a/browser/components/uitour/test/browser.ini
+++ b/browser/components/uitour/test/browser.ini
@@ -1,4 +1,9 @@
 [DEFAULT]
+prefs =
+    # With Fission enabled, this directory spawns many child processes, which
+    # somehow results in frequent leaks shutdown hangs. Reuse the content
+    # processes to avoid this.
+    dom.ipc.keepProcessesAlive.webIsolated.perOrigin=1
 support-files =
   head.js
   image.png