[nitrogen]

I was shopping for flights last Christmas and got price X on every site. I started checking out and the price became X+50. I got angry and left and came back later to find the price, on all sites, was X+80. Since I had no choice but to travel I paid X+80. Then for kicks and self torture I checked the price on my Android phone and it was still around X.

[isostatic]

Jacking up prices when revisiting the site from the same browser is a separate thing. It’s there to encourage you to buy ASAP as prices appear to be increasing rapidly.

[ccozan]

That's why I always start with an incognito tab and let FF do sime magic with the fingerprinting.

I get most honest prices.