I have a solution 8 years in the future, I wanted to slow down 3d pong because it gets quite hard, I came across a good way to fix it, but it requires you to have something that opens .swf files. Basically, download the .swf file of your game, open it and use cheat engine on the file, works like a charm. To download the .swf just use the inspect menu, find a link that ends in .swf-probably will be named the game's name as well-and click the link, it should auto download. Also note that I use adobe animate to open it, I don't know anything else to open it with but its a start.