Interesting thing about Mercury is that Prince [1] is written in it which is the only "browser" that supports the full print CSS spec and is widely used and considered the gold standard for converting HTML to PDF. Mercury was developed by the founders of Prince.

So you probably have used content created in Prince which is built with Mercury. Pretty interesting to have such a successful product built with your own programming language that is also as complex as a web browser [2].

1. https://en.wikipedia.org/wiki/Prince_(software)

2. https://www.princexml.com

I already brought this up with them, they knew about it but decided that it "doesn't have enough usage so we aren't worried about people getting our product confused with it".

I didn't know about this one. Frankly this looks a lot more than interesting than VB revival.