Mailshade — Tracker Blocker by Danila Pryadko

Protect your inbox from known email tracking without turning off ordinary images.

Mailshade uses Firefox Manifest V3 declarative network rules to block browser requests that match its reviewed catalog of known tracking-pixel endpoints. It works only on the webmail sites you explicitly enable.

• Block requests that match the reviewed catalog of known tracking-pixel endpoints.
• See confirmed pixels and recognized tracking links in an opened message.
• Mark a matching inbox row when the webmail service provides a stable message identity.
• Review activity by date, sender domain, and mail client.
• Get a warning before visiting a recognized tracking redirect. When the real destination is encoded in the address, Mailshade can open it directly.
• Adjust detection sensitivity, allow selected domains, clear history, or export Mailshade-owned data as JSON.
• Use light, dark, or automatic appearance in ten interface languages.

Enable only the inboxes you use. Gmail, Outlook, Microsoft 365, Superhuman Mail, Yahoo Mail, and Proton Mail are each enabled separately. Mailshade does not request access to every website, and it does not inspect a supported inbox until you grant access to that exact webmail site.

Current compatibility details: https://mailshade.org/platform/


Detection history stays in local IndexedDB in your Firefox profile and is not sent to Mailshade. Message bodies are not stored. To detect and attribute known trackers, the extension processes sender metadata, opaque message or thread identifiers supplied by the webmail service, and relevant image or link addresses.

Preferences are stored locally in the Firefox profile. They are not described as Firefox Sync data. Paid activation, customer-portal access, checkout, and optional crash reporting are separate user-initiated features described in the Privacy Policy.


Every new installation includes a 14-day Pro trial with no card required.

• Free includes core pixel protection, a rolling 7-day report, message indicators, tracking-link warnings with local decoding, and allow rules for tracker domains.
• Pro adds all retained history, the top 30 sender domains, filtered CSV export, and per-sender mute and strict-scan controls.

Paid options are $19 Founders Lifetime for the first 1,000 supporters, $59 Lifetime, $29 Annual, or $3.99 Monthly. Every paid option unlocks the same Pro features. Payments are processed by Polar as Merchant of Record, and each paid plan includes a 30-day refund.

Mailshade is open source under AGPL-3.0-or-later.

• Website: https://mailshade.org/
• Privacy Policy: https://mailshade.org/privacy/
• Terms: https://mailshade.org/terms/
• Refund Policy: https://mailshade.org/refund/
• Corresponding source: https://mailshade.org/source/