this would be possible. you can create incognito tabs via right click. each of these has a separate ephemeral profile, so separate sessions and cookies. you could then modify the user agent and navigator platform for each of those different browser contacts. however they still all go over the same IP.

not sure how to make different IP per tab, but perhaps proxy settings are scoped to the browser context, so it might be possible, haven't read the devtools protocol deeply about that.