Both support the same core features and offer incompatible
extensions.
Microsoft combined later versions of IE with their
filesystem browser, "Explorer" and bundled it with
Windows 95in an attempt to use their dominance of the
desktopbrowser, which they perceived as a potential threat. This,
and other dubious business moves, became the subject of a US
Department of Justice antitrust trial in late 1998/early 1999.
(1999-01-31)