diff --git a/core/state-manager.js b/core/state-manager.js
index b45dcd61..1de7e892 100644
--- a/core/state-manager.js
+++ b/core/state-manager.js
@@ -179,7 +179,7 @@ stateManager._createTab = function (tab) {
 
     chrome.webRequest.onBeforeRequest.addListener(function (requestDetails) {
 
-        let tab = stateManager.tabs[tabIdentifier].details || {};
+        tab = stateManager.tabs[tabIdentifier].details || {};
         return interceptor.handleRequest(requestDetails, tabIdentifier, tab);
 
     }, requestFilters, [WebRequest.BLOCKING]);
diff --git a/modules/internal/helpers.js b/modules/internal/helpers.js
index a4114225..3084def5 100644
--- a/modules/internal/helpers.js
+++ b/modules/internal/helpers.js
@@ -29,7 +29,7 @@ var helpers = {};
 
 helpers.insertI18nContentIntoDocument = function (document) {
 
-    let scriptDirection, defaultScriptDirection, i18nElements, translationComplete;
+    let scriptDirection, i18nElements, translationComplete;
 
     translationComplete = true;
     scriptDirection = helpers.determineScriptDirection(navigator.language);
diff --git a/pages/options/options.js b/pages/options/options.js
index ac0f0c88..44c389f6 100644
--- a/pages/options/options.js
+++ b/pages/options/options.js
@@ -217,11 +217,9 @@ options._onOptionChanged = function ({target}) {
     optionKey = target.getAttribute('data-option');
     optionType = target.getAttribute('type');
 
-    switch (optionType) {
-    case 'checkbox':
+    if (optionType === 'checkbox') {
         optionValue = target.checked;
-        break;
-    default:
+    } else {
         optionValue = target.value;
     }
 
diff --git a/pages/popup/popup.js b/pages/popup/popup.js
index 4df17de9..03e88688 100644
--- a/pages/popup/popup.js
+++ b/pages/popup/popup.js
@@ -52,7 +52,7 @@ popup._renderContents = function () {
 
 popup._renderNonContextualContents = function () {
 
-    let versionLabelElement, nameLabelElement, counterElement, testingUtilityLinkElement, optionsButtonElement, donationButtonElement, infoButtonLabel, infoButtonSVG;
+    let versionLabelElement, nameLabelElement, counterElement, testingUtilityLinkElement, optionsButtonElement, donationButtonElement, infoButtonLabel;
 
     versionLabelElement = document.getElementById('version-label');
     nameLabelElement = document.getElementById('name-label');