Although I may circle back to the XSS warnings (re: the last several posts), I wanted to update this thread on the original topic.
As noted in previous comments, the June 30 development release and ABE/XSS tweaks suggested by Barbaz seemed to improve performance on sites like tripadvisor. I attributed any further freeze-ups to my computer, which is getting rather long in the tooth (circa 2008 machine running XP).
I recently built a new Linux machine (7700K CPU with 32GB RAM, FF v54) and to my utter shock and amazement, tripadvisor is locking up FF on that machine! Pages load in what I would call 'fits and starts'. It takes about two minutes to finish loading a page with hotel listings for a random city. During that time, I'm only able to gain focus for intervals of a split second between long periods where the browser is frozen. Interestingly, the CPU is not active during those intervals so this is clearly not a resource issue. Once I disable NS, the same page always loads super fast.
Below is the readout from NS's flyout. My initial thought was that one of the blocked sites could be causing an active script to time out, with multiple retries. However, I tried temporarily allowing all seven blocked sites, and lock-up behavior was the same!
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+tripadvisor.com
+bing.com
+facebook.net
+pinimg.com
+tacdn.com
+googletagservices.com
!tamgrt.com
!googleadservices.com
!criteo.net
!doubleclick.net
!scorecardresearch.com
!mathtag.com
!smartertravel.com