Bigin's Gmail add-on simplifies the process of adding contact information from emails into Bigin. Plus, you can view the complete contact information of your existing customers whenever you open their emails. 

You can even use this extension in the Gmail mobile application. This means that you don't need to switch between multiple applications to have a complete view of the contacts in your pipeline. 

About Bigin: 
Bigin is a pipeline-centric CRM solution that helps small and micro businesses easily move away from spreadsheets and other inefficient ways of managing their customer relationships. 

Learn more about Bigin here : https://zoho.com/bigin