Thanks for your reply, sgunhouse.
I've not worked out stylus as yet - keeps asking to enable something on chrome, which I don't have. But will look further into it. Thanks. Maybe Opera GX can integrate a colourblind option. Even a strikethrough would be handy.

Is it possible, on Opera GX, to change the link colours? Or is there a colourblind option? I can not tell the difference, at all, between the blue (unopened) and purple (opened) links. It's quite frustrating.

Thanks