CMDK for Firefox: Gmail Hotkeys, Read Receipts & Snooze

What is CMDK for Firefox?

CMDK is a native Firefox add-on that puts a Cmd+K command bar, 25+ keyboard shortcuts, read receipts, natural-language snooze and snippets right inside Gmail. It runs locally in your browser, never reads or stores your email, and puts no AI on your inbox. It is free for 15 days, then from $9/mo, a Superhuman alternative that never makes you leave Gmail.

Prefer Safari on a Mac? CMDK is now on Safari too, see CMDK for Safari.

Everything CMDK does, now in Firefox

Command bar (Cmd+K)

Press Cmd+K for every email action: reply, archive, label, snooze, and more. No mouse, no menu hunting. It runs locally in your browser.

25+ keyboard shortcuts

Reply, archive, delete, label and snooze without leaving the keyboard. The same muscle memory Chrome users have, now in Firefox.

Read receipts

See when your sent email is opened, with WhatsApp-style checkmarks in your inbox. The tracking pixel is yours, and CMDK never reads your email content.

Natural-language snooze

Type "next Monday 9am" and the email comes back exactly then. Reminders and follow-ups without a separate app.

Snippets

Reusable templates you drop in by typing a semicolon, with smart variables and placeholders. Stop retyping the same replies.

Split inbox

Tabs that separate work, personal and project mail at a glance, right on top of your existing Gmail.

CMDK vs Superhuman vs Gmail’s Gemini

	CMDK	Superhuman	Gmail + Gemini
Reads or stores your email	No, runs locally	Yes, for AI	Yes
AI on your inbox	None	Core to the product	On by default
Lock-in	None, sits on Gmail	New app to migrate to	You are already in it
Price	From $9/mo or $169 lifetime	$30/mo	Bundled with your data
Works in Firefox	Yes, native add-on	No extension	n/a
Free trial	15 days, no card	No free trial	n/a

Built for how Firefox users think

Never reads your email

No AI on your inbox

No lock-in

A third of the price

Common Questions

Does CMDK read my email?

No. CMDK runs entirely in your browser as a Firefox add-on. It never uploads, reads, or stores the contents of your emails on any server. It only accesses Gmail to perform the actions you initiate.

Does CMDK put AI on my inbox?

No. CMDK is deterministic keyboard productivity, not an LLM. There is no AI reading, summarising, or training on your mail. If you have turned Gmail's Gemini off, CMDK still works exactly the same.

Is CMDK really a Firefox add-on?

Yes. CMDK is a native add-on listed on addons.mozilla.org, reviewed by Mozilla, supporting Firefox 128 and up. It is not a Chrome extension in a wrapper; it has full feature parity with the Chrome version.

Which features work on Firefox?

All of them. The command bar, 25+ keyboard shortcuts, read receipts, natural-language snooze, snippets and split inbox all work the same in Firefox as they do in Chrome.

How much does CMDK cost?

CMDK starts at $9/mo with a 15-day free trial and no credit card required. A $169 lifetime licence is available if you prefer to pay once. Superhuman, by comparison, is $30/mo with no free trial.

How is CMDK different from Superhuman on Firefox?

Superhuman has no Firefox extension at all, requires you to migrate to a separate app, reads and stores your email for AI, and costs $30/mo. CMDK is a native Firefox add-on that works inside Gmail, keeps your email private, and starts at $9/mo.

Have more questions? Contact Us ›

Wall of love

Loved by customers all across the world

Nice app. I like Gmail UI, but the shortcode options of Superhuman. So your app is the best of both worlds!

CMDK for Firefox: Gmail Hotkeys, Read Receipts & Snooze

Brian Dainis

Literally the best email extension you could get. Amazing alternative to Superhuman. Super clean and just works. Definitely worth the price and they are super responsive to feedback.

Danny Nielsen

Solid extension that provides many of the key benefits of MUCH pricier tools. Even better that this lives in Gmail, so you can use other extensions as well.

Zachary Eisenstat

Great - simple as it says, but adds a bunch of convenient time saving features. I don't need a full on client, I just need my Gmail to be fast, and this does it.

Dilip Goswami

Really good and helpful. And the developer was even very responsive to feedback!

Dominic Roser

This is awesome. It massively speeds up and simplifies usage of Gmail. Great pricepoint too, and the developer is super active and amazing at feedback and improvements.

Brent Maxwell

Love it! This extension helps me fly through my emails so I can get out of my inbox and back to revenue producing work. And great support!

Bill Brelsford

Works like a charm! Exceptionally GREAT SUPPORT - even for as small language as Hungarian. It can totally replace Superhuman.

Zoltán Szabó

I have started using CMDK as a layer over my gmail. Once I got used to it I love it. CMDK provide real-time support - most impressive!

Chris Hallowes

Your Gmail just got superpowers. Now on Firefox.

Command bar, keyboard shortcuts, read receipts and snooze, right inside Gmail. Runs locally. Never reads your email.