diff --git a/pkgs/applications/networking/browsers/firefox/wrapper.nix b/pkgs/applications/networking/browsers/firefox/wrapper.nix
index 2a4db14b2c6d..3ed06717f6a2 100644
--- a/pkgs/applications/networking/browsers/firefox/wrapper.nix
+++ b/pkgs/applications/networking/browsers/firefox/wrapper.nix
@@ -129,6 +129,8 @@ let
             --set MOZ_APP_LAUNCHER "${browserName}${nameSuffix}" \
             --set MOZ_SYSTEM_DIR "$out/lib/mozilla" \
             --set SNAP_NAME "firefox" \
+            --set MOZ_LEGACY_PROFILES 1 \
+            --set MOZ_ALLOW_DOWNGRADE 1 \
             ${lib.optionalString gdkWayland ''
               --set GDK_BACKEND "wayland" \
             ''}${lib.optionalString (browser ? gtk3)