1938
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.
it's not a strict useragnent filter, they're displaying this for all browsers that don't have the web usb api
firefox does not support it yet (support is planned afaik)
Never heard of it, so had to look it up:
How could it be safer?? I don't want websites to be able to access my peripherals!
you need to confirm and select a device before a website can gain access to it.
there are multiple legitimate uses for this, such as:
It's nice to be able to change my keymaps on my keychron keyboard, or configure my kbdfans RGB knob to have different bindings, but I really don't want to install chrome or a chromium based browser for one weird trick.
I like my OS to be simple, I don't want multiple browsers or loads of applications to manage different devices.
mozilla wont https://mozilla.github.io/standards-positions/#webusb