Everyone can use it easily. It's an easy tool to use. You don't need a Google account to install an extension.
> What do I do?
Install the extension and use postman easily.
> What do I do?
Install the extension and use postman easily.
EDIT: If like me, you're using a Mac, you can use Alfred to open Postman. I still have no idea where to find the extension (I have both the extension and the "packaged app", whatever the difference is, installed on my machine)