Jazz Jackrabbit 2 Online

Hey,

I've been trying to make animated gifs of Jazz from this game, and I've been using F12 to take screenshots of the game so I can put them together into an animated gif (after I edit out the background obviously). Anyway, I seem to only be able to take one screenshot at a time now, when before I could always hold down F12 to get all the frames I need at once. Then I would delete the ones I don't need. How can I make it so I can take many screenshots at once again? Is there a limit to how many I can take in one day or something?