How to Allow Third Party Cookies in 2024: A Step-by-Step Guide for Marketers & Event Planners (Without Breaking Privacy Laws or Losing Tracking)

By lisa-anderson · April 30, 2025

Why Allowing Third-Party Cookies Matters More Than Ever — Especially for Events

If you're asking how to allow third party cookies, you're likely trying to restore critical functionality for your event marketing stack: lead tracking from LinkedIn ads, post-registration retargeting, cross-domain analytics for multi-step registration flows, or live chat integrations that remember user behavior across your website and partner sites. But here’s the uncomfortable truth: as of January 2024, Google Chrome has begun its phased rollout of the Tracking Protection API, effectively deprecating third-party cookies for 1% of users — with full deprecation scheduled for late 2024. Safari and Firefox have blocked them by default for years. So while this guide walks you through the technical steps to enable them *where possible*, it also equips you with future-proof, privacy-first alternatives that actually work in today’s fragmented ecosystem.

What Are Third-Party Cookies — And Why Do Event Platforms Rely on Them?

Third-party cookies are small text files placed on a user’s device not by the website they’re visiting, but by a domain different from the one shown in the browser’s address bar. For example, when someone lands on your conference registration page (yourconference.com) and sees a Facebook Pixel or Google Analytics 4 (GA4) tag loading from google-analytics.com or facebook.com, those domains drop third-party cookies to track behavior across sites.

In event planning, these cookies power essential workflows: tracking a prospect who clicks your Instagram ad → lands on your event landing page → abandons the form → and later converts after seeing a retargeted email banner. Without them, that attribution breaks — and your ROI calculations become guesswork. A 2023 EventMB study found that 68% of mid-sized event teams reported a 22–37% drop in measurable cross-channel conversion lift after Safari’s Intelligent Tracking Prevention (ITP) updates — directly impacting budget renewal decisions.

But crucially: allowing third-party cookies isn’t just about flipping a switch. It’s about understanding *which* cookies serve legitimate business needs (like fraud prevention or single sign-on), which are purely for surveillance advertising (and increasingly illegal under GDPR/CPRA), and how to comply while preserving functionality.

How to Allow Third-Party Cookies: Browser-by-Browser Instructions (2024)

While disabling third-party cookies is now the default in all major browsers, many enterprise environments, internal testing setups, or legacy marketing tools still require manual enablement — especially during QA cycles or for specific vendor integrations (e.g., virtual event platforms using embedded Zoom Web SDKs). Below are verified, up-to-date instructions for each major browser — including hidden flags and enterprise policy paths.

Browser	Steps to Allow Third-Party Cookies	Enterprise/Admin Note	Effective Until
Google Chrome	1. Go to `chrome://settings/cookies` 2. Toggle ON “Allow all cookies” 3. Under “Sites that can always use cookies”, add domains like `google.com`, `facebook.com`, `zoom.us` ⚠️ Requires disabling “Block third-party cookies in Incognito” separately	Admins can enforce via Group Policy: `Computer Configuration → Administrative Templates → Google → Google Chrome → Content Settings → Cookies → Allow third-party cookies`	Phased deprecation begins Q2 2024; full disable expected Q4 2024
Safari (macOS/iOS)	1. Open Safari → Preferences → Privacy 2. Uncheck “Prevent cross-site tracking” 3. Also uncheck “Block all cookies” (if enabled) 💡 Note: Even when unchecked, ITP 2.4+ still partitions cookies by top-level domain — limiting true cross-site persistence	No enterprise-wide toggle exists; requires per-device configuration or MDM profile deployment with `WebKitPreferences.allowCrossSiteTracking` = YES	Already enforced since Safari 13 (2019); no sunset date — permanent default
Mozilla Firefox	1. Type `about:preferences#privacy` in address bar 2. Under “Enhanced Tracking Protection”, select “Custom” 3. Uncheck “Cookies” 4. Optionally add exceptions under “Manage Exceptions”	IT admins can deploy via `autoconfig.js` or `prefs.js`: `network.cookie.cookieBehavior = 1` (0 = block all, 1 = allow all, 2 = block third-party)	No announced deprecation timeline; Mozilla prioritizes user control over deprecation
Microsoft Edge	1. Navigate to `edge://settings/cookies` 2. Select “Allow all cookies” 3. Add trusted domains under “Sites that can always use cookies” ✅ Edge uses Chromium engine, so behavior mirrors Chrome — but respects Windows Defender SmartScreen policies	GPO path: `Computer Configuration → Policies → Administrative Templates → Microsoft Edge → Privacy, search, and services → Cookies → Allow third-party cookies`	Aligns with Chrome’s timeline; full disable expected late 2024

The Hard Truth: Enabling Third-Party Cookies Often Doesn’t Solve Your Real Problem

Here’s what most tutorials won’t tell you: even if you successfully allow third-party cookies in Chrome, they’ll likely be partitioned (isolated to the top-level site context) or cleared after 7 days due to Storage Access API restrictions. In practice, this means your GA4 event tags may fire — but attribution windows shrink, cross-domain paths break, and cohort analysis collapses.

Consider this real-world case: TechCon 2023 used a custom-built registration flow spanning landing.techcon.com, register.techcon.com, and payment.stripe.com. With third-party cookies enabled, they saw 89% session continuity. After Chrome’s 100+ update, that dropped to 41% — despite identical cookie settings. Their solution? They migrated to first-party data stitching using GA4’s setConsent API + server-side tagging, plus URL parameter pass-through for UTM values across subdomains.

So before you spend hours enabling cookies, ask: What specific business outcome am I trying to restore? If it’s:

Lead attribution → Prioritize server-side GA4 + UTMs + offline conversion imports
Personalized post-event content → Leverage zero-party data (preference centers, post-event surveys)
Fraud detection → Use device fingerprinting (with explicit consent) + behavioral biometrics
Live chat continuity → Implement authenticated chat sessions tied to CRM IDs

These approaches don’t depend on third-party cookies — and often deliver higher accuracy and compliance.

Privacy-First Alternatives That Actually Work in 2024

Forward-thinking event teams aren’t fighting browser changes — they’re building resilience. Here’s what’s replacing third-party cookies, with implementation tips:

✅ First-Party Data Hubs

Collect email, job title, industry, and intent signals (e.g., “downloaded agenda PDF”) directly via progressive profiling forms. Tools like HubSpot Events or Cvent’s Audience Builder let you segment registrants and sync to ad platforms without cookies using hashed emails (SHA-256) — compliant with Apple’s App Tracking Transparency and Google’s Privacy Sandbox proposals.

✅ Google’s Topics API (Privacy Sandbox)

Instead of tracking individuals, Topics infers broad interest categories (e.g., “Technology > Cloud Computing”) from a user’s recent browsing history — then shares only the top 5 topics weekly. For events, this means you can still target “people interested in AI conferences” without knowing their identity. To activate: ensure your GA4 property has “Topics API” enabled in Admin → Data Streams → Configure Tag Settings.

✅ Server-Side Tagging + Consent Mode v2

Move tracking logic off the user’s browser and onto your own secure server. GA4’s Consent Mode v2 lets you adjust data collection based on user consent status — sending anonymized pings for analytics when consent is denied, and full event data when granted. Bonus: bypasses ad blockers and cookie restrictions entirely. Implementation requires a lightweight cloud function (e.g., Cloudflare Workers or AWS Lambda) — but Cvent and Bizzabo now offer native server-side tag managers.

Frequently Asked Questions

Does allowing third-party cookies violate GDPR or CCPA?

Yes — if done without explicit, granular, revocable consent. GDPR Article 5(3) and CCPA §1798.100 require informed opt-in for non-essential cookies. Simply enabling them in browser settings doesn’t satisfy legal requirements. You must still display a compliant cookie banner (e.g., OneTrust, Osano), document consent, and honor global privacy controls like the GPC signal. Allowing cookies ≠ legal compliance.

Will allowing third-party cookies fix my broken Facebook Pixel?

Unlikely. Facebook Pixel now relies heavily on Aggregated Event Measurement (AEM) and Conversions API — both server-side. Even with cookies enabled, iOS 14+ and Chrome’s partitioning limit pixel’s ability to attribute conversions beyond 7-day windows. The real fix is implementing Conversions API alongside your pixel, sending key events (e.g., ‘CompleteRegistration’) directly from your server.

Can I allow third-party cookies only for specific domains (e.g., Zoom or Stripe)?

Yes — and this is strongly recommended. In Chrome, go to chrome://settings/cookies → “Sites that can always use cookies” → add zoom.us, stripe.com, paypal.com. This avoids blanket permission while preserving critical payment and video functionality. Safari offers similar “Website Settings” per domain under Preferences → Privacy → Manage Website Data.

My team uses Google Analytics 4 — do I need third-party cookies for it to work?

No. GA4 was built for a cookieless world. It uses first-party cookies by default (_ga, _gid) and relies on Client ID persistence, modeling, and event-based architecture. Third-party cookies were never required. If GA4 appears broken, check your gtag implementation, consent mode setup, or whether your ad blocker is blocking analytics.google.com.

What’s the difference between third-party cookies and first-party cookies in event tech?

First-party cookies are set by your own domain (e.g., yourconference.com) and persist across your subdomains — ideal for remembering cart items, login state, or language preference. Third-party cookies come from external domains (e.g., doubleclick.net) and enable cross-site tracking. For events, first-party cookies handle UX; third-party cookies handled attribution — but that role is now shifting to server-side and contextual signals.

Common Myths About Third-Party Cookies

Myth #1: “If I allow third-party cookies, my analytics will be 100% accurate again.”
Reality: Modern browser restrictions (partitioning, expiration, storage limits) mean even enabled cookies rarely provide full-fidelity tracking. GA4’s modeling fills gaps — but accuracy depends more on data quality and implementation than cookie status.

Myth #2: “Blocking third-party cookies breaks my registration form.”
Reality: Registration forms use first-party cookies and server sessions. What breaks is *post-submission retargeting* or *cross-site lead scoring*. The form itself remains fully functional — and more secure without unnecessary third-party scripts.

Conclusion & Next Steps

Learning how to allow third party cookies is a useful tactical skill — but in 2024, it’s rapidly becoming a rearview-mirror activity. The real competitive advantage lies in building event marketing systems that thrive without them: first-party data strategies, server-side infrastructure, and consent-aware analytics. Start this week by auditing your current cookie dependencies — identify which tools truly need third-party access (e.g., fraud vendors) versus which are merely legacy (e.g., old remarketing pixels). Then prioritize one privacy-first alternative: implement GA4 Consent Mode v2, migrate one high-value conversion to Conversions API, or launch a preference center to capture zero-party signals. Your attendees — and your compliance officer — will thank you.