I am not sure if I chose the correct topic for my question... I just purchased a new computer and installed Thunderbird for my email server. I noticed that I do not have "next" and "before" (I think it was "before") in the top bar, so that when I am reading an email, I can just click "next" to go to the next email. (I had those two choices in Thunderbird on my previous computer.) Is there a way to get those up there in the same area where there is "get messages, write, chat, address book, tag"?