Embeded Form treated as Tracking Content on Firefox

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This same issue (default browser-based tracking prevention settings blocking HubSpot Forms from loading) now also affects other browsers like Microsoft Edge and Safari.

Below is a simple script (<3kb, open source, and vanilla JS only) we created to detect when tracking prevention is blocking your HubSpot forms from loading and alerts visitors with step-by-step instructions (specific to each browser) to fix the problem. Here’s how it looks:

This script is open source and maintained here on Github, so feel free to submit any issues or pull requests.

More details and installation instructions here.

<script> // Detect HubSpot forms blocked by browser tracking prevention (Edge, Firefox, Safari)
// Built by Insiteful.co (C) Copyright 2025 Insiteful
// MIT License: https://opensource.org/license/mit
(function() {
 // Check if browser is Edge, Firefox, or Safari
 function getBrowser() {
 const isEdge = /Edg/.test(navigator.userAgent);
 const isFirefox = /Firefox/.test(navigator.userAgent);
 const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
 return { isEdge, isFirefox, isSafari, any: isEdge || isFirefox || isSafari };
 }

 // Check if tracking prevention is likely enabled
 function isTrackingPreventionEnabled() {
 if (!navigator.cookieEnabled) {
 return true;
 }

 // Check for Do Not Track
 if (navigator.doNotTrack === "1" || window.doNotTrack === "1") {
 return true;
 }

 // Check storage access (strict mode blocks this)
 try {
 localStorage.setItem('test', 'test');
 localStorage.removeItem('test');
 } catch (e) {
 return true;
 }

 return false;
 }

 // Check if HubSpot is blocked
 function isHubSpotBlocked() {
 if (typeof window.HubSpotConversations === 'undefined' && 
 typeof window.hbspt === 'undefined') {
 return true;
 }
 return false;
 }

 // Run checks
 function checkAndAlert() {
 const browser = getBrowser();
 const trackingPrevention = isTrackingPreventionEnabled();
 const hubspotBlocked = isHubSpotBlocked();

 if (browser.any && (trackingPrevention || hubspotBlocked)) {
 let browserName = '';
 let instructions = '';

 if (browser.isEdge) {
 browserName = 'Microsoft Edge';
 instructions = '1. Click the lock icon in the address bar\n' +
 '2. Turn off "Tracking prevention" for this site\n' +
 '3. Refresh the page';
 } else if (browser.isFirefox) {
 browserName = 'Firefox';
 instructions = '1. Click the shield icon in the address bar\n' +
 '2. Turn off "Enhanced Tracking Protection" for this site\n' +
 '3. Refresh the page';
 } else if (browser.isSafari) {
 browserName = 'Safari';
 instructions = '1. Go to Safari > Settings (or Preferences)\n' +
 '2. Click on Privacy\n' +
 '3. Uncheck "Prevent cross-site tracking"\n' +
 '4. Refresh the page';
 }

 alert(
 '⚠️ Tracking Prevention Detected\n\n' +
 `It appears you are using ${browserName} with strict tracking prevention enabled, ` +
 'which may be blocking HubSpot forms and other features.\n\n' +
 'To ensure full functionality, please:\n' +
 instructions
 );
 }
 }

 // Wait for HubSpot to load (or fail to load)
 setTimeout(checkAndAlert, 2000);
})();</script>