Despite the fact that the Highscore table isn't really readable when using Edge. But that problem exists with every size. Maybe I have to manually create the image and give it a Font instead of using the GreenfootImage(String, int, Color, Color) constructor to create the image automatically. Maybe that causes the browser to use a default Font. (Just guessing.)

The window size is apparently fixed and does not update when the next world has a different size. You can download it to play in a different size at least. @davmac: Any chance that the window size here on the site could update every time Greenfoot.setWorld is called?

I just noticed that I copied the Highscore table which shows the best three results instead of only the best one from my other scenario without changing how the scores are saved, so only the best one is showing. Doesn't matter too much since it doesn't run online anyway I guess...