Need help.

sorry if this is in the wrong section, im a noob here and this looked like the best place to post this.

i am trying to decrypt a game's packets, and i know that i need to use ollydbg and find the algorithm that the client decrypts the packets with, but i don't know how to debug the client because it is browser based so i don't think i can just attach ollydbg to mozilla or firefox.

also it is a flash client but when i download it from the page info, and try to run it in a flash player it loops at a loading screen.......

I don't know, but he used way too many big words for the general section