For some reason whenever I click the CHelper Extension in google chrome it doesn't parse the task and it simply does not work. Are there any fixes?

I am quite new to competitive programming specifically, and I would like to participate in the USACO Competitions. I was researching and I found a Java plugin called CHelper. I was wondering if CHelper is useful for solving USACO problems as it requires File I/O instead of the standard System.in. I would greatly appreciate any advice on this topic and it is greatly needed.

Thank you, BabyElephant