We are developing a Flash game. Since we upgraded from Firefox 3.5 to 3.6 we have noticed a strange performance issue. Our game uses http to make requests for assets that are loaded into the game. Since the browser upgrade, there is at least a 10 second delay each time Flash tries to load image data that has already been cached. The strange thing is that if you minimize the browser, the request comes through instantly. We confirmed this behavior using an extension called HttpFox which allows you to view incoming and outgoing requests. We also reverted back to Firefox 3.5 and confirmed that the issue did not occur in that version. Additionally, we've confirmed that this issue does not occur in either IE8 or Chrome for Windows. == This happened == Every time Firefox opened == We upgraded to Firefox 3.6