One time I told an interviewer was my biggest weakness is my unwillingness to repair my relationship with my father. I did not get the job, but I got a good laugh. I guess making the interviewer uncomfortable is bad.
I use Safari for general browsing because it is fast and familiar. I use Firefox for web development because the add-ons and tools such as firebug and web developer toolbar can not be beat.
http://www.yiiframework.com/