I develop a web application and we test it on several browsers, including Firefox and Internet Explorer. During our development we tested the application on Firefox 3.5.2 and our testing team tested the same on 3.5.6 and found the UI looks good. Once in production, though, we've started receiving client complaints that it doesn't look good in 3.5.8.
How do we handle these minor version issues? How can we check the browser compatibility during development and during testing?
Is there any tool to test the application on 3.5.X, X being all the minor versions?