Flash 11 slow response or Not working on Firefox 18 windows 7

I'm working in a flash project that usually use to call javascript from html. But when I update firefox to version 18. When I call javascript from flash it will take awhile to response. For example I make a simple flash with 1 button and it will run"alert","testing"); when I click on it. It work fine in Chrome and IE but in firefox 18 it take a long time to fire that alert.

Can anybody have me to solve thisĀ ?

I apologize for my bad english.