Lemon, I’m often travelling, so a portable printer and an iPhone are all I need now. No hard copies of reference books for me.
The only other site on Safari you might need is Quinapalus Word Matcher, (or Chambers Word Wizard) if you have several letters of an answer. That, and the occasional foray to Wikipedia, is all you need for 98% of Listener puzzles, imho.
https://www.quinapalus.com/cgi-bin/match?
Of course, you may regard using these aids as cheating. My old Latin master thought using a dictionary was just that. O tempora, o mores!