The web browser which actually made the web usable and popularized it was Mosaic.
"Mosaic was developed at the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana–Champaign beginning in late 1992." -- Wikipedia
Other than Linux's European origin, Europe has not produced any viable operating system or browser. It continues to rely on key software of American origin, like the rest of the world.