Thanks for the tip! I had `user-select: none` on the container which had the glass inside of it but apparently that didn't work. I just updated the page with `user-select: none` on the glass itself and it looks like that did the job.
I assumed that by them saying "installing desktop Safari" they are using an OS other than macOS since Safari comes preinstalled on macOS and can't even be uninstalled at least not without disabling System Integrity Protection.
Yeah it's basically fine in Safari because mobile requires a double tap to highlight, but only a single click on desktop. So highlighting is more intentional on mobile than desktop.