diff --git a/browser/config/mozconfigs/macosx64/debug-searchfox b/browser/config/mozconfigs/macosx64/debug-searchfox
index 526fd941f330..f475b91e1199 100644
--- a/browser/config/mozconfigs/macosx64/debug-searchfox
+++ b/browser/config/mozconfigs/macosx64/debug-searchfox
@@ -7,6 +7,10 @@ MOZ_AUTOMATION_L10N_CHECK=0
 ac_add_options --enable-debug
 ac_add_options --enable-dmd
 
+# Save rust analysis (this requires unlocking the unstable features)
+export RUSTC_BOOTSTRAP=1
+export RUSTFLAGS="-Zsave-analysis"
+
 ac_add_options --enable-clang-plugin
 ac_add_options --enable-mozsearch-plugin