MOSS 2007 gives cross browser compatabity issue on firefox and chrome and also in higher version of IE (9 & 11)

I am getting browser compatablity issue when MOSS 2007 is used on IE 9 & 11 and on other browsers like firefox and chrome.

I also face issue while using the latest version of third party Intersoft WebUI 2014 R2 controls. Although the older version of Intersoft WebUI 2008 controls were working fine with MOSS in IE7 browser. But recently WebGrids are not loading properly and the WebCombo dropdowns doesn't work. After apporaching the Intersoft on tis issue they said their latest version of Intersoft is compatible with MOSS 2007.

In this process of upgrade I learnt that the Intersoft Sample which comes with their setup can be run on Visual Studio 2010 and above. So I would like to know whether MOSS 2007 support VS 2010 or not.

Accepting response on my queries.