"...it has never been an infringement, in either English or EU law, for a person merely to view or read an infringing article in physical form."
Basically, that "viewing" something is not a breach of copyright - you can read a book without being in breach of copyright.
It was considered that "browsing a web page" made temporary copies that were considered a breach for various reasons. There are clauses in the legislation to allow these transient copies (on screen, cache in memory and disk, etc) but only for lawful use, and the argument was that reading the web page could be unlawful if not licensed. But the judgement here says that "reading" the information in a web page does not need a licence, and so is lawful and therefore so are the transient copies made as part of that process.
Choosing to download or print a web page is not the same, that is protected, but simply viewing a web page is not a breach of copyright.