Tempx Browser Extension

A temporary inbox that lives in your toolbar instead of a tab you keep losing. The extension watches one mailbox, shows an unread count on its icon, and opens the inbox from the popup when something arrives. That's the whole job, done properly.

What it does

• Tracks one inbox — either a public named inbox (the address is the only credential) or a private random inbox read with its token.
• Unread badge — the extension checks for new mail about once a minute in the background and puts the count on the icon. No tab kept open, no manual refreshing.
• Get a first address in one click — the popup offers a random adjective-noun-NN@tempx.uk style address without opening the site first.
• Opens the real inbox — clicking through opens the Tempx web app on that mailbox. Reading mail happens on the site, under the same sanitization and sandboxing as always; the extension never renders message content itself.

Connecting a private inbox without pasting tokens

Private inboxes are read with a bearer token, and the extension never asks you to paste one into a dialog. Instead you click Connect in the popup, the site opens with a one-time pairing nonce in the fragment, a content script hands the credential over exactly once, and the nonce is spent. The token itself never appears in a URL, and the pairing only works on the real Tempx origin with a live nonce — so a copied link is worthless.

Bot checks stay on the site too. The extension never bypasses or automates the human-verification step; it reads mail you've already been given access to.

What it doesn't do

• No sending — Tempx is receive-only, the extension included.
• No message content goes anywhere except between the extension and tempx.uk, over the same API the web app uses.
• No analytics, no browsing history, no access to other sites' data.
• One mailbox at a time by design — swap it from the popup when you want a different inbox.

Data handling follows the site's Privacy Policy: your inbox record stays in the extension's local storage on your machine, and deleted mail is deleted.

Install

The Chrome Web Store and Firefox Add-ons listings are going through review. Until they're public, both builds can be loaded directly — the extension is plain JavaScript with no build step and no bundled dependencies, so what you load is what's in the source.

• Chrome (desktop): open chrome://extensions, enable Developer mode, click Load unpacked, and select the extension folder.
• Firefox: open about:debugging → This Firefox → Load Temporary Add-on, and pick the manifest; or run it with npx web-ext run if you have the source.

Once the store listings are live, this page links to them directly.

Which inbox kind to track

A named inbox is public — anyone who types the same name sees the same mail — so it suits low-stakes watching: a download you're waiting for, a one-off signup. A private inbox is the better default: its address is unguessable and only readable with the token your browser holds, with messages deleted an hour after they arrive. The badge doesn't care which one it is; your threat model should.

Related: What is temporary email? · How Tempx works · FAQ

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