Slack Custom Emoji Manager

Add the following features to Slack's custom emoji management page. - Add more emoji at once - Upload aliases via _alias.json (drag & drop) - Delete all emoji at once - Download all emoji and aliases as zip (includes _alias.json) === Change Log === ・v1.4.0 - Added alias upload: drop "_alias.json" to register aliases in bulk. - Improved stability of UI injection. ・v1.2.1 - bugfix Fixed adding and deleting emoji to work. ・v1.2.0 Popup is released! You can now access the emoji customization faster.