CMDK (pka. Simplehuman)

CMDK is a browser extension that makes Gmail faster with a command bar and 80+ keyboard shortcuts. Snooze messages using natural language, track emails with read receipts, split your inbox into tabs, switch accounts with hotkeys, and jump anywhere with quick navigation. It nudges you to learn shortcuts as you work and requires no access to your email inbox, helping you triage faster while keeping privacy intact.

CMDK was previous known as Simplehuman. But lawyers got involved.