I tried surfing to the Mt. Gox site and my computer gave me a security warning.  Subsequently I went there via explorer rather than Mozilla and over-rode the security warning.  Once there, I noticed the "green thing" on the web bar didn't appear?

1. Is this a bogus site?
2. Is there something wrong with my computer?
3. Should I refrain from logging in to Mt. Gox after ignoring security warning?  So far, I haven't.