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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.
And that's exactly the problem, it's by design to pull you into a proprietary ecosystem and squeeze you for your money. Since companies have more incentive to make things NOT work across platforms than they do to work together, we're not getting out of this mess without government regulations in the countries that matter (so, USA and Europe.... Mostly Europe...)
Case in point: Apple and USB C, or phones and removable batteries.
@JGrffn Totally agree.