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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.
They support opera but not firefox -_-
Isn't that because Opera is Chromium based?
Yeah, swapped to it about 10 years ago.
Oh i still remembered it having an in house engine.
I wonder what would happen if you changed your user agent and told Firefox to say it's Chrome
Nothing much, because the required code isn't in Firefox. For a change, there is a legitimate (albeit shitty) reason for the display of the failure page.