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As if it wasn't bad enough that they want me to use a random internet service to add a keyboard to a usb wifi receiver, they have the balls to put this for Firefox users. I clicked out of pure curiosity, as I'm not even remotely interested in involving a corporate internet service in getting my keyboard connected to my computer. This is the message you get now on Logi Options software if you have a Unifying Receiver: 
For the curious: https://logiwebconnect.com
EDIT: some people on the thread have brought up that the error message being displayed for Firefox users is due to the WebUSB API not being implemented by Firefox due to security concerns. This still does not justify having to use a web app to plug peripherals to a PC.
VIA jumped onboard to this proprietary stuff, too: https://usevia.app
It's a real shame. Related threads for both Logitech and VIA:
I hated when via moved to using a web browser to remapping, since I find it hard to trust if the website is compromised. Fortunately my keyboard can do vial.
Vial has its own security issues it promised to solve but didn’t necessarily. I think it still exposes the keyboard matrix activity to any software that asks for it.