diff --git a/pkgs/applications/networking/browsers/firefox/packages.nix b/pkgs/applications/networking/browsers/firefox/packages.nix
index 4789d394b73e..94aa4d74feb6 100644
--- a/pkgs/applications/networking/browsers/firefox/packages.nix
+++ b/pkgs/applications/networking/browsers/firefox/packages.nix
@@ -78,5 +78,6 @@ rec {
   }).override {
     crashreporterSupport = false;
     enableOfficialBranding = false;
+    pgoSupport = false; # Profiling gets stuck and doesn't terminate.
   };
 }