Although it is not fully standardised, Firefox 119 and later should have it work [1]. It's now up to server implementations to get there as well. [1] https://d

Although it is not fully standardised, Firefox 119 and later should have it work [1]. It's now up to server implementations to get there as well. [1] https://defo.ie/ech-check.php https://defo.ie/ech-check.php