ArchView can open archive file online without downloading the whole archive. Just like normal web pages. It is very fast since it merely fetches a small portion of the archive file from server. ArchView supports RAR, ZIP formats and ISO CD image; HTTP, FTP and file: protocols. And it can present XUL or HTML interface.
Old version here https://addons.mozilla.org/en-US/firefox/addon/archview/?src=search