Snoopie

Snoopie is an extremely simple (and friendly) extension that simply lets you know when the website you’re currently browsing uses a popular tracking service.

Currently supported:
– Fullstory (fullstory.com)
– inspectlet (inspectlet.com)
– hotjar (hotjar.com)
– mouseflow (mouseflow.com)
– hoverowl (hoverowl.com)
– Lucky Orange (luckyorange.com)
– Ptengine (ptengine.com)
– SessionCam (sessioncam.com)

This extension is fully open-sourced here: https://github.com/davidbyttow/snoopie