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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.
Yeah, why not just use Bluetooth, almost everything made in the last few years supports Bluetooth and it doesn't need a shitty proprietary dongle.
the device comes with the dongle that connects it. In an office environment with machines that do not have wireless or bluetooth, you are stuck. The only time this app is any use is when you get the help desk call and someone tells you their new mouse doesn't work and they have a bunch of neighbors (in cubes or offices) that have the same hardware.
As I learned once I started using it with Bluetooth, Bluetooth devices don't work during POST, so I've had to have a secondary wired keyboard at hand for whenever I go into the bios.
Even the shity 1 cent aliexpress mouse does Bluetooth...