diff --git a/src/drivers/npm/index.js b/src/drivers/npm/index.js
index b453c72a7..54a3fb43d 100644
--- a/src/drivers/npm/index.js
+++ b/src/drivers/npm/index.js
@@ -16,10 +16,8 @@ wappalyzer.analyze(url)
   .then(json => {
     process.stdout.write(JSON.stringify(json) + '\n')
 
-    process.exit(0);
+    process.exit();
   })
   .catch(error => {
-    process.stderr.write(error + '\n')
-
-    process.exit(1);
+    throw error
   });
diff --git a/src/drivers/npm/package.json b/src/drivers/npm/package.json
index 31284418f..5a935ba14 100644
--- a/src/drivers/npm/package.json
+++ b/src/drivers/npm/package.json
@@ -2,7 +2,7 @@
   "name": "wappalyzer",
   "description": "Uncovers the technologies used on websites",
   "homepage": "https://github.com/AliasIO/Wappalyzer",
-  "version": "5.0.1",
+  "version": "5.0.2",
   "author": "Elbert Alias",
   "license": "GPL-3.0",
   "repository": {
diff --git a/src/drivers/webextension/js/driver.js b/src/drivers/webextension/js/driver.js
index 739d00275..a90e2805d 100644
--- a/src/drivers/webextension/js/driver.js
+++ b/src/drivers/webextension/js/driver.js
@@ -1,7 +1,9 @@
 /**
  * WebExtension driver
  */
-              setOption('robotsTxtCache', {});
+
+/** global: browser */
+/** global: wappalyzer */
 
 var tabCache = {};
 var headersCache = {};
diff --git a/src/drivers/webextension/js/options.js b/src/drivers/webextension/js/options.js
index afdc37bc1..9486a8edc 100644
--- a/src/drivers/webextension/js/options.js
+++ b/src/drivers/webextension/js/options.js
@@ -1,3 +1,6 @@
+/** global: browser */
+/** global: wappalyzer */
+
 function getOption(name, defaultValue, callback) {
   browser.storage.local.get(name)
     .then(item => {
diff --git a/src/drivers/webextension/js/popup.js b/src/drivers/webextension/js/popup.js
index 9bb9ca49b..34f55c0a2 100644
--- a/src/drivers/webextension/js/popup.js
+++ b/src/drivers/webextension/js/popup.js
@@ -51,8 +51,7 @@ function replaceDom(domTemplate) {
 
 function appsToDomTemplate(response) {
   var
-    appName, confidence, version,
-    categories = [],
+    appName, confidence, version, categories,
     template = [];
 
   if ( response.tabCache && Object.keys(response.tabCache.detected).length > 0 ) {