I got a the popup in Chrome on Win10, and called the number from FireRTC and no one answered.
Phone Number: 1-801-850-0924
Popup: https://imgur.com/a/VngC2uX
If anyone has any luck with them, let me know.
(801) 850-0924 is a voip number based in USA.
It is operated by Twilio - Inteliquent - SMS-Sybase365/MMS-SVR.
Owner Name : WEST VALLEY, UT
It can be reported to [email protected] and usually they shut down the number when provided with the spam/scam info.