What is your favorite google Extension for daily productivity?

The Gyroscope chrome extension gives you a breakdown of how you spend your time online - I was shocked how much time I used to spend on reddit before I downloaded this.

I spend way too much time writing emails, and Brief keeps me from rambling on for paragraphs at a time. Super helpful.

Tracks how much time I spend reading and writing emails, and then I can export a report that shows me who I'm spending all that time with. For freelancers, you can use the report to charge clients for that time you spent. Otherwise, it's just good to know who your time sucks are.

There is no need to check email every 5 minutes; emails fly out as push notification :)