Loved using this to ensure my products were colorblind accessible. Includes a lot more colorblind options than other tests I've used. Other tests don't include vision loss either. Worked great for a long time but more recently has been lagging or just not working at all. Think it's been a number of years since it's been updated. A new update is needed please!

It works well with the vision loss and grayscale options, but the rest of the options absolutely do not work (e.g. I still see the color red when selecting "Protanopia"). I'm using the latest version of Firefox (126.0). I have script blockers installed (uBlock origin and NoScript), maybe the problem comes from that, but it would be surprising as the vision loss and grayscale options work perfectly well.