Reveal URLs

Phishing relies on a simple trick: a link's visible text says one thing (paypal․com) while its real destination points somewhere else (paypal․account-verify․example), or hides behind a tracker or redirector that says nothing about where you will end up.

Reveal URLs shows you the URL each link in your mail points to and flags the ones where the visible text disagrees with it.

• See each link's URL inline above the link, and on hover in its tooltip.
• Mismatched links are highlighted in a colour you choose (red by default); honest links are shown in your "match" colour (a neutral dark grey by default).
• Works on FastMail, Gmail, Outlook Live, Outlook 365, Proton Mail, Tuta, Yahoo Mail, Zoho Mail in the browser out of the box, and on every message in Thunderbird regardless of provider.
• Optionally works on additional webmail hosts you add yourself: open the options page, enter the host and the message-body selector, and grant the permission when your browser asks; nothing runs on a host until you opt in.
• No accounts, no tracking, no servers: everything happens locally in your browser. The extension only reveals and flags links; it never changes, blocks or rewrites where a link points.

Reveal URLs reads your settings from your browser's own sync/local storage and acts only on the built-in webmail pages listed below plus any host you add and grant yourself.

Also see: Email link phishing: your app should always show the URL.