I visited an online eyeglass vendor and they had a "see how they look on you" feature that required permission to use the iMac camera, which I granted. After looking at a few frames I went to my Safari Preferences to turn off the permission.
While the Prefs were open I took the opportunity to check a couple of other things and found that the eyeglass site had also toggled on my microphone. I removed the microphone permission that hadn't been knowingly granted.
My landline phone has a handset extension on the computer desk and I therefore have a lot of conversations in front of the computer. It's scary to think that the microphone would have been open during future conversations if I had not poked around in my Safari preferences.
Edited by ryck (08/24/19 07:10 AM)
iMac (Retina 5K, 27", 2017), 3.4 GHz Intel Core i5, 8GB RAM, 2400 MHz DDR4
OS Mojave 10.14.6
Canon MX710 Printer
Epson Perfection V500 Photo Scanner
Time Machine on 1TB LaCie USB-C
Carbon Copy Clone on 500GB OWC Mercury OTG Pro