I am playing sudoku from https://www.korsordonline.com/cross?id=37707 on Firefox 128.5esr (64bit) on Debian 12. The square in row 3 (from above) column 5 is irresponsive. Clicking on it produces nothing. It doesn't even change colour as other squares do and you cannot write a number in it. Earlier versions of Firefox never had that problem. Later versions do, e.g. Firefox 130+ on Ubuntu 24 which I run on other hardware. It seems to be a problem between some new property of Firefox and the developer's sudoku app, since it doesn't occur in other browsers (I tested chrome a while ago). Could any firefox developer look into this? Thanks,