diff --git a/js/dlg/message-box.js b/js/dlg/message-box.js
index f7008d77..d3be66b0 100644
--- a/js/dlg/message-box.js
+++ b/js/dlg/message-box.js
@@ -1,4 +1,5 @@
 /* global $ $create animateElement focusAccessibility moveFocus */// dom.js
+/* global clamp */// toolbox.js
 /* global t */// localization.js
 'use strict';
 
@@ -84,10 +85,6 @@ messageBox.show = async ({
     messageBox._resolve = resolve;
   });
 
-  function clamp(value, min, max) {
-    return Math.min(Math.max(value, min), max);
-  }
-
   function initOwnListeners() {
     let listening = false;
     let offsetX = 0;
diff --git a/js/dom-on-load.js b/js/dom-on-load.js
index 05e63b9a..f3f9db34 100644
--- a/js/dom-on-load.js
+++ b/js/dom-on-load.js
@@ -1,5 +1,5 @@
 /* global $$ $ $create focusAccessibility getEventKeyName moveFocus */// dom.js
-/* global debounce */// toolbox.js
+/* global clamp debounce */// toolbox.js
 /* global t */// localization.js
 'use strict';
 
@@ -34,7 +34,7 @@
       const key = isSelect ? 'selectedIndex' : 'valueAsNumber';
       const old = el[key];
       const rawVal = old + Math.sign(event.deltaY) * (el.step || 1);
-      el[key] = Math.max(el.min || 0, Math.min(el.max || el.length - 1, rawVal));
+      el[key] = clamp(rawVal, el.min || 0, el.max || el.length - 1);
       if (el[key] !== old) {
         el.dispatchEvent(new Event('change', {bubbles: true}));
       }
diff --git a/options/options.js b/options/options.js
index fbaa7f12..1590fa32 100644
--- a/options/options.js
+++ b/options/options.js
@@ -17,6 +17,7 @@
   OPERA
   URLS
   capitalize
+  clamp
   ignoreChromeError
   openURL
 */// toolbox.js
@@ -288,7 +289,7 @@ function enforceInputRange(element) {
     if (type === 'input' && element.checkValidity()) {
       doNotify();
     } else if (type === 'change' && !element.checkValidity()) {
-      element.value = Math.max(min, Math.min(max, Number(element.value)));
+      element.value = clamp(Number(element.value), min, max);
       doNotify();
     }
   };
diff --git a/popup/popup.js b/popup/popup.js
index 6e028e3f..6c6f4e95 100644
--- a/popup/popup.js
+++ b/popup/popup.js
@@ -10,6 +10,7 @@
   FIREFOX
   URLS
   capitalize
+  clamp
   getActiveTab
   isEmptyObj
 */// toolbox.js
@@ -66,7 +67,7 @@ function onRuntimeMessage(msg) {
 
 function setPopupWidth(_key, width) {
   document.body.style.width =
-    Math.max(200, Math.min(800, width)) + 'px';
+    clamp(width, 200, 800) + 'px';
 }
 
 function toggleSideBorders(_key, state) {