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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.
I went through two G903s due to bad switches which would fire multiple clicks per physical click. Ended up buying aftermarket buttons for the second one and it's been great. Now I wish I had other options for mice; Logitech was the only brand to bring a very nice solution for wireless charging mats to the market, and as far as I know they've been unchallenged in that. I'm stuck in the Logitech ecosystem due to that powerplay mat, but I guess as soon as my G903 dies for good, I'm ditching it and trying whatever else I can, knowing full well it will be a downgrade coming from my current setup. It's a painful realization.