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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.
Is it to download the driver or for something else?
Well from some quick reading online, it's not for downloading drivers. It's literally an internet service Logitech is forcing its users to use in order to connect their peripherals, it's insane.
I used to buy logitech mice, but this is reason enough for me to never buy their products again.
It's also insane just how bad the GHUB app is in general. I still want the Logitech Gaming Software back, which was just so much superior.
What do you find bad in it? I use it mostly for switching meaning of side buttons on mouse and foe changing rgb patterns. It just works
It's a real resource hog on my PC that I've had to uninstall and reinstall several times when it breaks, and it doesn't give you options for which directory you have to install it.
Look at this shit, all for some lights and buttons?
In fairness you can offload profiles to your mouse or whatever and just kill the software. Mouse works fine afterward but without the fancy, awful, per application button mapping. That was always a slow and buggy feature.
Does it offload the LED light settings as well? Because the default drives me nuts.
You can disable or set static lights in the onboard profile. How? It’s confusing and I don’t remember. Very dark pattern but probably not on purpose. Just bad design.
Sweet, I'll research it because it would sure be nice to delete the app
Ghub is the reason I stopped buying Logitech hardware years ago. This just confirms that I should continue buying from their competitors.
Yeah it's a shame, I genuinely like their hardware, and have for over 20 years at this point.
Quality has gone down, gone up again, gone down again, the usual stuff. On a hardware level I had way more issues wth Razer and Corsair than I ever had with Logitech.
But that piece of shit GHUB really makes the whole lineup unusable. And don't get me wrong, all these "gaming software drivers" (that are actually just Chromium browsers rendering a web page running on a local web server that is booted in teh background because the companies are too cheap to hire coders that can write efficient software and make their web developers do things I doubt they actually want to do) are terrible. But GHUB is a special kind of nonsense, nevermind how bad it looks, how it doesn't look at home on any OS, how slow it is, how it does the Skype thing of thinking it knows better than you what levels and volumes you want on your audio equipment and keeps messing with them, and how it randomly disables actually useful features like game-side lighting control in favor of baked-in stuff.
That’s a shame, I was considering the same model.