Dick Smiths Fair Go SupportersFirefox/TorBrowser has tab isolation so its likely not what you think. What is possible and more likely is #AmazonBrave stored your session, and realised you were unhappy with the search, because you searched again and gave you a (better) search result.
If niter is given, that is odd in itself.
Brave is #Amazon and uses #lazyLoading to determine how far you scroll down the results page, which feeds Amazon data.