@Carlos Siqueira beat me to the punch but I'll post anyway b/c we're so excited!  

Introducing the Lightning Extension!

Calling all Salesforce Lightning Fans! Do you and your users like to stay on the cutting edge? Do you often find yourself being an early adopter of the latest and greatest tech? With the *brand new* Lightning Extension on the Chrome Web Store, you can gain access to the latest Lightning features!

This extension provides users with rich feature enhancements that aren’t available out-of-the-box with Lightning, like Dark Mode, the ability to hide components, and more.  New features will be consistently added over time.

Install it here: https://sfdc.co/gQN2N

@Elna Miller @Jacinta Burke let's get this thing to go viral!