the wierd thing about LightBox running on firefox is that sometimes the image and the text below it are not aligned together. This example is from the LightBox 2 site itself:
See, if I'ld spent a lot of effort designing my photosite, that kind of stuff up would really get to me. Its just part of a bigger problem that html and its derivatives is rendered very differently on differnt browsers. There isnt always cross platform compatibility and that sucks.
That kind of problem doesn't effect flash sites.