I’m confused too, self checkout is the best thing ever, no social interaction and pretty much equally fast, while allowing for more checkouts in the same amt of space. Though tbf only if done properly. One store here started having them like 10 years ago and there was like a 10% chance each item that you’d have to call over an employee bc the scale didn’t work. Haven’t had any problems with the ones i encountered recently.
It works on OPs work laptop, also on ff. So it’s more likely that some combination of parameters which include the browser triggered their anti-bot protection, perhaps due to actual botting activity from a source with similar parameters.