In order to read news from a web browser, you will have to tell the browser where the news (or nntp) server is. The University's nntp server is at nntp.unsw.edu.au. With Mozilla and Thunderbird, this is done from the Window:Mail and Newsgroups dialog box.
To get a list of all available newsgroups, you can open the URL news:*. The results of this vary with the browser. Mozilla sorts the groups into alphabetical order and joins groups with the same prefix together. You can subscribe to newsgroups either by viewing the group and clicking Subscribe, or clicking the box to the left of the group in the list of groups and pressing Subscribe to selected newsgroups. Mozilla labels the list of subscribed newsgroups as newsrc://nntp.unsw.edu.au/. It will save the list of newsgroups in .newsrc-nntp.unsw.edu.au