=[[
"Gmail labs aren't yet compatible with all of our supported browsers. Labs are available only in Internet Explorer 7.0+, Firefox 2.0+, Safari 3.0+, and Google Chrome. You won't see a 'Labs' tab in your Settings if you're not using the newer version of Gmail on the browsers listed above. Please note that if you're using Internet Explorer 6.0, you will not have Gmail Labs."

see post #1