Firefox just introduced a cool feature that lets us set custom wallpapers on the home screen—love it! But whenever I try using pictures from my personal library, they don’t fit properly and end up getting cropped. Resizing doesn’t help either, since making the image smaller just ruins the quality.

So, is there a specific format I should be using? Like, does it need to be JPEG only, or will any file type work? And if any format is fine, what’s the ideal one for the best results? I couldn’t find anything in the settings or help pages about this.