Scrapebox Poster Question

When using the comment poster on Scrapebox, does it post via different browsers? I sometimes create backlinks via Firefox using a proxy but how does Scrapebox do this?
What exactly do the search engines see when links are built via Scrapebox?
Is there any advantage to creating my blog comments/backlinks all from Firefox using different proxies in the browser compared to using different proxies in Scrapebox?

Scrapebox does come with a file that has user information, such as OS, browser type, mobile or desktop, etc, in which the software will randomly select this information and pass it to the sites that it is posting.
Well commenting manually would definitely increase relevancy for the blog post, using Scrapebox, it will be difficult to have relevancy because your messages would be a general one and not about the content on the blogpost.