Gmail and Firefox 3.03/4

I have been using Firefox since version 2 and have not had any major problems.
I have recently had an issue when logging into my gmail account to read my email. I get a message that reads

For a better Google Mail experience, use a fully supported browser. Learn more

This is irritating because it also means that I don't have the full features available.

I have a supported Browser it seems but when i use IE, I have no problems.

Any suggestions?

 

To me, this means that Google Mail is behind the times, not supporting the new generation of Firefox3.x. However take a look at this