Okay, this is actually unusable now.

I can't say when it happened, as I don't use FT every day at present but it is recent.

Now getting stuck in feedback loops:
javascript determines page not scrolling length, therefore doesn't do a certain page layout.
Inserts adverts appropriate for non-scrolling layout.
Advert insertion makes page scroll, javascript updates page presentation to reflect scrolling layout.
Changes adverts to suit scrolling layout.
Page no longer scrolls due to changes.
Goto 1.

Gets stuck in this loop (loading quickly through loads of adverts) until a combination appears that stabilises. Or until I click back.

13" MBP running Safari should certainly be in any test bank.