Cannot navigate to title pages

If I go to the www.imdb.com home page, I can search for titles, but if I click on the link for a matching title, my browser hangs and eventually times out. This happens even if I type in an explicit URL such as https://www.imdb.com/title/tt0083420 My browser (Firefox) displays a status of "waiting for unagi.amazon.com". I can navigate to people pages fine; it's only titles that don't work. I have reproduced this on two different computers (one Win 10, one Android) using both Firefox and Dolphin browsers, and using two different internet connections (my home VDSL network and my Adroid phone's mobile internet via Vodafone). Looks as if there's a problem...