In the past when visiting a website, using Linux/Firefox, that broke on my system, I promptly swore at the webmaster for not developing a website that was W3C compatible or at least not tested under different platforms for compatibility!

I would like the world to change and for web developers to not only design their webspace for Internet Explorer.  However, until this happens(and I'm not sure I will be that lucky in my life time), I have discovered the User Agent Switcher Firefox Addon.  It allows you to change the packet of data that is sent to the server and you can then essentially tell it that you are browsing the website using IE7 and Windows Vista.  So far, it works and I am chuffed, here is just one example that I have recently come across, where the flash menu lands up on top of everything else.  Switching the User Agent, hitting refresh, and it looks good, YAY. 

Using the Default Firefox User Agent - note the big blue block on the left

Using the IE7 Windows Vista setting

Try it out and let me know if you have any success stories.