To hack Criminal Case first of download and update the following.
1. Adobe Flash Player (install it manually again, even if you have it installed)
2. Cheat Engine
After installing the two above, start up firefox and load up the game. Start the game, and load it till the point where the game is just about to start.
Now open cheat engine, and click on select process
Now, Select the flash player process (as it is a flash game and loads in the flash player)
To enable the speed hack, check on the speedhack checkbox.
Then decrease the value to 0.5 (It will decrease the game speed by half)
disable the speed hack as soon as the game is completed, else your game will be voided and you will have to start all over again.