Recently active topics in Twitter tagged with browser

It works in IE, Safari, and Opera. But in firefox, it doesn't. please help! I have firefox 2.0.0.14

why does twitter not warn people signing up not to use the FireFox browser? I have signed up for twitter throwing away 2 of my favorite userids. now, i cannot sign-up for twitter using my favorite screen names because twitter says there are already taken but now nobody can use them. What type of nightmare interface do they have that does not work with their so-called "two words" scheme excpet I.E.?

Since the blow up yesterday I get the annoying "This page contains both secure and non secure items. Do you want to display the nonsecure items?" Window and it's driving me crazy. This happens with all requests.