Huh. Must be leftover from the early days of the mobile Internet. Kinda like Reddit’s old mobile site (which now just redirects to Reddit’s current mobile site).
You should be able to modify the desktop shortcut to run the command every time you click it.
Alternatively, you can create a batch file that runs the command every time you click on it and put it on your desktop. You could probably even assign the Firefox icon to it and pin it to your task bar.
It might be that second one. I was thinking it was m.reddit.com.