[ALUG] Cookie issue with Firefox

I'm one of the millions who enjoy (?) playing Wordle. But I like it in dark mode. If I try to save the url in Firefox [ like this: https://www.nytimes.com/games/wordle/index.html ] so I view it in that mode every time, I cannot. It reverts to the general New York Times one, like this - www.nytimes.com. None of the stuff after the forward strokes. What can I do? (Firefox version 155.) Googling has not helped at all. Bev