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Live on the Chrome Web Store

Push emoji into Slack in one click.

The EmojiBox extension sends custom emoji straight from emojibox.app into your Slack workspace. No PNG downloads, no copy-paste, no admin settings page.

Add to ChromeAdd to FirefoxSoonBrowse the collection

On Firefox? The AMO listing is still in review — grab the dev build and load it unpacked:

Download dev build (.zip)
How to install ↓
  1. Unzip the file somewhere stable.
  2. Open and click This Firefox.
  3. Click Load Temporary Add-on and pick the manifest.json inside the unzipped folder.
  4. Reload this page - the install CTA flips to a workspace picker.

Heads up: Firefox unloads temporary add-ons when you quit the browser - you'll need to reload it next session until the AMO listing is approved.

At a glance
Manifest
MV3
Bundle size
< 20 KB
Permissions
Slack + EmojiBox
Tokens leave browser
Never

How it works

01

Install the extension

Add EmojiBox to your browser. The extension only runs on emojibox.app and slack.com - nothing else.

02

Open Slack web

Visit app.slack.com once in any tab. The extension links every workspace you're signed into automatically - nothing for you to configure.

03

Push emoji from EmojiBox

Click Push to Slack on any emoji or collection, pick a workspace, and watch them appear in Slack. Skips emoji you already have.

What about my Slack tokens?

Slack doesn't expose a public emoji-upload API, so the extension uses your own logged-in Slack session - the same way the Slack web app does. Your session token never leaves your browser. EmojiBox only learns the names of the emoji you pushed and which workspace they went to.

The extension only activates on emojibox.app and slack.com. It can't read other tabs, your messages, or your channels.