I use this extension (and the app) regularly, which activates as soon as I visit Amazon in a container tab. In addition to providing in-depth statistics, features like alerts via Telegram have helped me hunt down bargains. I have noticed the increase in network requests and bandwidth when the tab is active, using basic tracking via Resource Monitor (W10). However, I can easily block it via uMatrix/uBO, if required. In this case, it is a trade-off, which can be justified.
Also, Tracker Control (Android) for Keepa app reports blocking just two trackers Google Crashlytics and Google Firebase Analytics -- so it is not as bad other apps.
I have used CamelCamelCamel in the past, which was more egregious and aggressive in tracking users, but don't know how it fares today.
