Several mailboxes at once — one per browser tab

Published: 2026-07-31

One address is rarely enough for one evening. You are registering on a forum in one tab, waiting for a shop's confirmation in another, and testing your own sign-up form in a third. Here that works the way you would hope: each browser tab holds its own mailbox. Tab one stays on its address, tab two stays on its own, and mail for each arrives in the tab that is waiting for it.

Why this needs saying at all

Because on most sites of this kind it does not work. They keep “the current mailbox” as a single value, so generating a new address in a second tab silently changes the first one too — you come back to the tab that was waiting for a code and find a different inbox looking at you. This site keeps the mailbox per tab instead of per browser, so opening a new one never disturbs a tab you left open.

Opening the second, third and fourth

From the list of addresses you already use. Open Inbox email in the top menu and middle-click an address, or hold Ctrl (⌘ on a Mac) while clicking it — the browser opens it in a new tab, and the tab you were on stays exactly where it was. A plain left click switches the current tab to that mailbox instead.
A brand-new address. Open the site in a new tab and generate one there, or type a name and pick a domain. It belongs to that tab from then on.
Yesterday's set, all at once. If you closed the browser with several mailboxes open, the next visit offers to bring them back — see below.

🗂️

A tidy habit: one tab per purpose, not per message. The shop's tab, the forum's tab, the test account's tab. When a purpose is finished, close its tab — the address keeps working if you ever need it again, and you can find it in the list.

Mail arrives in the right tab, and tells you which one

Messages appear on their own, without refreshing, in whichever tab is showing that mailbox. If a message lands in a mailbox you are not currently looking at, the address gets a red dot in the Inbox email list, so a glance at the panel tells you where the code went. Addresses that have actually received mail are tinted, which separates the ones doing real work from the ones you merely looked at.

The list of mailboxes you used before

The Inbox email button in the top menu opens a panel with two lists side by side.

List	What it holds
Inbox email	Addresses you have used, newest first. Click one to open that mailbox again — it is not an archive of messages, it is a way back to the mailbox.
Sessions	Groups of tabs that were open together, filed by the day you closed them. Expand a day and you see which addresses were in that set.

The list does not fill up with everything you glance at. An address is remembered when something real happened in it — mail arrived, you copied the address, you opened a message, or you simply stayed with it for a couple of minutes. Pages you opened and left straight away are not worth remembering, so they are not.

Picking up where you left off

Close the browser with four mailboxes open, come back tomorrow, and the site notices that the previous set is gone. A few seconds after the page loads it offers to restore them — Restore all in new tabs reopens the whole set, one tab each, or you can open just the one you need from the Sessions card for that day.

🔒

Only sets of two or more tabs are filed as a session — a single tab is not a session worth keeping. Sessions are grouped per day, so closing the browser three times on Tuesday gives you one Tuesday card, not three.

Where all this is stored — and what that means

Both lists live in your own browser's storage. They are never sent to the server: the site does not keep a record of which addresses belong together, because it does not have one. The practical consequences are worth knowing:

It is per browser and per device. The list you built on your laptop is not on your phone, and Chrome does not see what Firefox remembers.
Private / incognito windows forget everything on close. That is the point of them — but it means no list tomorrow.
Clearing site data clears the list. The mailboxes themselves are unaffected; you simply lose the shortcuts back to them.
You can wipe it yourself at any time. Each list has its own clear button in the panel.
It does not grow forever. Roughly a hundred recent addresses are kept, for up to a year; sessions are kept for a few months. Older entries drop off on their own.

⚠️

Because the list is only a set of shortcuts, treat it as convenience, not as safekeeping. If an address matters to you next month — the one a subscription or an account is tied to — write it down somewhere of your own, or give that account an address on your own domain, where the name is yours for good.

What this is good for

Registering on several sites in one sitting without codes landing in the wrong place, and without one address tying those accounts together.
Testing your own sign-up flow. Three tabs, three fresh accounts, three inboxes side by side — no aliases, no mail client, nothing to clean up afterwards.
Waiting on files. Tickets and PDFs land in the tab that ordered them — see attachments in a generated mailbox.
Keeping one address per site as a habit, which is much easier when the addresses you use are one click away — a separate address for every website.

Generate an email address →

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