diff --git a/pkgs/firefox-extensions/wrapFirefoxAddonsHook/wrap-firefox-addons-hook.sh b/pkgs/firefox-extensions/wrapFirefoxAddonsHook/wrap-firefox-addons-hook.sh
index df8d6b74c..dade87902 100644
--- a/pkgs/firefox-extensions/wrapFirefoxAddonsHook/wrap-firefox-addons-hook.sh
+++ b/pkgs/firefox-extensions/wrapFirefoxAddonsHook/wrap-firefox-addons-hook.sh
@@ -50,16 +50,10 @@ fixupFirefoxAddon() {
 }
 
 fixupFirefoxAddons() {
-  if [ -f "$out" ]; then
-    # the output is a single firefox extension (legacy)
-    # TODO: remove this code path
-    fixupFirefoxAddon "$out"
-  else
-    # crawl the output for .xpi files to fixup
-    for xpi in $(@find@ "$out" -name '*.xpi'); do
-      fixupFirefoxAddon "$xpi"
-    done
-  fi
+  # crawl the output for .xpi files to fixup
+  for xpi in $(@find@ "$out" -name '*.xpi'); do
+    fixupFirefoxAddon "$xpi"
+  done
 }
 
 if [ -z "${dontFixupFirefoxAddons-}" ]; then