diff --git a/make_scripts/make_firefox.sh b/make_scripts/make_firefox.sh
index 15d30ab..e766a54 100755
--- a/make_scripts/make_firefox.sh
+++ b/make_scripts/make_firefox.sh
@@ -5,6 +5,8 @@ sciezka=$(dirname "$0")
 
 cd $sciezka/../src
 
+function npm-do { (PATH=$(npm bin):$PATH; eval $@;) }
+
 npm-do shipit firefox ./
 
 if [ -f ./web-ext-artifacts/polish_cookie_consent-*.xpi ]; then