diff --git a/.gitignore b/.gitignore
index 94dc3faf8..c06d22ad4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -43,4 +43,5 @@ js/copayBundle.js
 config.js
 webapp
 chrome-extension
+firefox-addon
 version.js
diff --git a/util/generate-app-extension.sh b/util/generate-app-extension.sh
index 07bfe2b50..a5870b421 100755
--- a/util/generate-app-extension.sh
+++ b/util/generate-app-extension.sh
@@ -90,6 +90,7 @@ zip -r $CHROMEZIPFILE $CHROMEDIR
 checkOK
 
 mkdir -p $CHROMEDOWNLOADDIR
+mkdir -p $FIREFOXDOWNLOADDIR
 mv $ZIPFILE $DOWNLOADDIR
 mv $CHROMEZIPFILE $CHROMEDOWNLOADDIR
 cp index-download-chrome.html $CHROMEDOWNLOADDIR/index.html