Hey so I've been having this issue where the Ticketmaster website (no matter which country) does not work on Firefox... It just shows that message in the image.
I've tried disabling my VPN, uBlockOrigin, Privacy Badger, Firefox's Enhanced Tracking Protection, but no avail. I had to use G**gl* Chr*m* the other day to buy a ticket. Weird enough, I just tried using Firefox in my work laptop and the site worked without issues, even with uBlockOrigin and Privacy Badger enabled.
Any tips that might solve this without resetting my whole browser to default settings? Thanks!
A few years ago I noticed some compatibility differences between my personal machine and my work laptop. My work machine was required to have Firefox ESR. Maybe you'll have better luck with ESR?
For any specific unresolvable compatibility issues, I usually use Ungoogled Chromium.