I confirm the add-on/extension issue: the NSW site looks like Sandie's view on my "Anonymous" profile with just privacy add-ons enabled, but like Exiv96's screenshot on my usual profile (which has a lot more add-ons, including web-developing tools).
I use GNU/Linux (Linux Mint LMDE, to be precise), so I don't think it's related to the operating system.

@ Exiv96 and antp: What kind of add-ons do you have?