diff --git a/.npmignore b/.npmignore
index 32f4dcd3806e..54dd1f505efe 100644
--- a/.npmignore
+++ b/.npmignore
@@ -31,6 +31,8 @@ timings-data/
 # ignore all folders named as such
 node_modules
 latest-run
+chromium-webtests
+.tmp
 
 # generated files
 **/pages/scripts/lighthouse-report.js