New link opening method makes hackerone vulnerable to tabnabbing

How it was found

Summary: Hackerone recently changed how it opens the external links and this new way is vulnerable to tabnabbing. Description: Please see the POC.

Steps To Reproduce

1. Click here: https://awasthi7.github.io/
2. Click on proceed when warning appears.
3. The site will open in new tab and hackerone tab will be replaced by Google.

Optional: Your Environment (Browser version, Device, etc)

Optional: Supporting Material/References (Screenshots)

Impact

Unvalidated redirect