Setup Handler in Chrome
1. Open Chrome and navigate to “Settings.”
2. Click “Content settings” under “Privacy and security.”
In the Settings tab that appears in your Chrome browser, scroll down to the bottom and click “Advanced.” This will expand your settings options. In the first group that appears, “Privacy and security,” click “Content settings” second from the bottom.
3. Select “Handlers” and switch on the Ask protocol.
Click this setting and you’ll see at least one horizontal switch where you can allow any website you visit to ask you if it can become Chrome’s default “handler.” Switch this setting to the on position, as shown below. (If it’s already switched on, switch it off and on again — this can prompt Gmail to re-ask you to become your default handler.)
4. Open Gmail in Chrome and click the Protocol Handler icon.
Once your Ask protocol has been switched on for default handlers, open Gmail in a new tab and make sure you’re signed in.
5. Allow Gmail to open all email links.
At the end of your URL’s address bar, you’ll see a new icon that looks like two gray diamonds intertwined with each other. Click this icon and you’ll see the following dropdown menu: