If your leads or visitors are using Mozilla Firefox (version 59 or later) private browsing mode, we won’t be able to capture UTM parameters when they land on your website/landing pages. This is because Firefox has made changes to prevent leaking user data to third parties when users choose private browsing mode. For more information, see Mozilla Security Blog -Preventing data leaks by stripping path information in HTTP Referrers.
Lead/Visitor Tracking Limitations with Mozilla Firefox Private Browsing Mode
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