The browser extension does not automatically populate any value in the username/password fields of a recognised site.
If the current URL is stored in Zoho Vault, why not simply pre-fill the username and password of the last used item?
LastPass does this. In fact, it does it intelligently - it pre-fills the last used item, and also if I click on the action icon it shows all the relevant passwords sorted chronologically by last used date time. That makes it super fast to use.