Very useful application.

The feature to set alerts and configure a profile really makes it stand out. I appreciate that, if the popup doesn't load while behind a VPN because the exit node IP got an activity warning, I can click the hyperlink right in the window to pass the cloudfare check, and it works on the next click of the camel icon. You can even run this on android via custom addon collection on FF Nightly or Mull (you have to trigger it through the menu, but it works).

I reserve one star because Amazon seems to be moving toward adding flat $ or %-off coupons that users "clip" by clicking a checkbox due to the psychological effect it has on shoppers, and this app does not yet consider those figures into the price, so sometimes the graph and price history don't paint the whole picture.