I am looking for a plugin that will log the page loading time for a web based application.

BUT:

1) I do not need to display it in the toolbar for the user using the application but I need to collect this information & send this information back to the application performance team. 2) I have no access to the application and I cannot inject anything into the html being sent from the server. I need a browser-installable solution or a user computer installable computer.

A broader picture: there is a 3d party application which is showing performance problems (long page load times). We need to monitor this – how bat it is, when it happens, where it happens etc. So I need to get URL/page load time for a specific URL each time when real people are using the application, and I need to send this information back to the monitoring server (Zabbix server in my situation).

What is NOT working: Selenium (page is very javascript heavy) – so Selenium fails.