How to make Gmail as the default browser?

[mariahcarey]

If you are referring to setting Gmail as the default email handler for email links clicked in a web browser:

Google Chrome:
Open Chrome.
Click on the three dots in the top-right corner to open the menu.
Go to "Settings."
Scroll down to the "Privacy and security" section.
Click on "Site settings."
Scroll down to "Handlers" and select "Allow sites to ask to become default handlers for protocols."