Is //js-agent.newrelic.com a potential virus?

Hi all,

First off I'd like to say I'm new to these forums so I appologize if this was either answered before, or posted in the wrong section.

I got this mac a few months ago from my parents for the primary use of school. In the past couple of months they've restricted the websites in parental controls so it's basically about 3-4 school websites. When I opened firefox this morning I saw the parental control pop-up asking my to add a site. These have always popped up and I never really take any notice to them, but today I did. It said something about allowing this site and the link was along the lines of: https://js-agent.newrelic.com. I currently don't have a third party anti-virus installed, so I'm not really sure what it is or if I should be concerned. I looked up new relic and it said it was some kind of remote monitering program! This made me feel extremely uneasy... If you have any advice or might know what it is, please let me know. Thanks <3