diff --git a/pkgs/development/tools/web-ext/default.nix b/pkgs/development/tools/web-ext/default.nix
index acadcd94b57f..494eee2e6a96 100644
--- a/pkgs/development/tools/web-ext/default.nix
+++ b/pkgs/development/tools/web-ext/default.nix
@@ -1,6 +1,8 @@
 { lib
 , buildNpmPackage
 , fetchFromGitHub
+, runCommand
+, web-ext
 }:
 
 buildNpmPackage rec {
@@ -16,6 +18,13 @@ buildNpmPackage rec {
 
   npmDepsHash = "sha256-KPBKUjCxva11w/E+Qhlx+1vikpCL7Hr9MiKenYHEVSU=";
 
+  npmBuildFlags = [ "--production" ];
+
+  passthru.tests.help = runCommand "${pname}-tests" { } ''
+    ${web-ext}/bin/web-ext --help
+    touch $out
+  '';
+
   meta = {
     description = "A command line tool to help build, run, and test web extensions";
     homepage = "https://github.com/mozilla/web-ext";