Avant Browser 2012 Build 172
* [Update] Firefox rendering engine(188.8.131.5245)
* [Update] Chrome rendering engine(19.0.1084.56)
* [Fix][Gecko] Firefox.exe crashing problem aftering enabling silverlight
* [Fix][Webkit] For the same link,Avant Downloader can't pop up twice after canceling the first task.
* [Fix][Webkit] Searching via Address Bar failed.
* [Fix][Trident] Saving AutoFill dialog automatically popped up when loading a page
* [Fix] Avant Downloader can't detect videos on certain sites
* [Fix] The video on the page sometimes played in the background after clicking the full screen button on the video player.