Is it just me or does the newest version of Firefox not have the ability to choose your wallpaper?

I updated my firefox to Version 143.0.4 (64-bit). (I am using Mac). I was trying to change my wallpaper, so I went to the pencil and customize part of the new tab, and when I look at the wallpaper thing, I just see that it says "Reset to default". I didn't see any of the things that said upload image or any of that. just reset to default. I really wanted to change my wallpaper, so is there something I'm missing or something?