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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.
Problem are extra funtionalities. I have a MX Mastee 3. Works perfectly on Linux, but is has a additional Button for the Thumb. Can't be configured on Linux officially. There's a third party script called Logiops. It sometimes work, but it's not relieable either...
My setup is based around Logitech Unified Receivers and my linux desktop. I use solaar for pairing, which offers more functionaliry that Logitechs own software does for Windows
Solaar is 100x better than the crappy official app.
I have a Logitech K380 that for some goddamned reason by default requires Fn keys pressed to use function keys normally. On Win and MacOS their software can be used to turn it off. On Linux it's a bunch of scripts that sometimes work and sometimes don't.
I have a keyboard with the same anti feature. It is beyond stupid. I used to like Logitech stuff, since 2016 or so when I got that keyboard I've hated them. I've had a couple other of their devices since then, and they always come with some bullshit that require their special software or a special account to disable.
I fuckin hate Logitech now.
I had a Logitech mouse and keyboard. OpenRGB and Piper can be used to set the RGB and adjust the bindings, DPI etc