Software to notify me of a web page change ?

[thatsright]

Need some free software that will alert me if a specific we page has changed any thing. Added a new picture or text. Sometimes I find limited time sales online that sell out within 12 seconds because I was to late to check. This would prevent that, in theory.

 

[manko]

https://addons.mozilla.org/en-US/firefox/addon/check4change/