Certainly there have been no changes to my extensions or 3rd party software in the past week, and I have very few of either to start with. I did make some changes to privacy settings in Firefox, but changing them back did not restore my ad-free experience.

My recollection is that I had similar trouble with ads some years ago, and I solved the problem by turning off javascript when I visited FlyerTalk. That seems to kill the in-line ads, which are really annoying because they change the location of features on the screen. Maybe I've just been lucky the past few years.

Thanks for looking into it.