Is this a legitimate script to be trying to run in my browser?

moz-extension://e34513bd-5a92-4348-843c-47c8aa743da7/scripts/contentInject.js While I was looking at something that I am working on at the moment I noticed that this was trying to run I've cut the message list, SEE BELOW Is this a legitimate script to be trying to run in my browser? Thanks in advance... GEThttp://localhost/ourNextphaseDotOrg/userUi.html [HTTP/1.1 200 OK 0ms] GEThttp://localhost/ourNextphaseDotOrg/CSS/caterMaster.css GEThttp://localhost/ourNextphaseDotOrg/CSS/logosmaller.gif [HTTP/1.1 200 OK 57ms] ******************************************************************************* ''''''Layout was forced before the page was fully loaded. If stylesheets are not yet loaded this may cause a flash of unstyled content. contentInject.js:5251:17'''''' ******************************************************************************* GEThttp://localhost/ourNextphaseDotOrg/CSS/newfavicon.ico GEThttp://localhost/ourNextphaseDotOrg/CSS/style.css GEThttp://localhost/ourNextphaseDotOrg/CSS/clearCss.css GEThttp://localhost/ourNextphaseDotOrg/CSS/MoonBack.png [HTTP/1.1 200 OK 0ms]