Are you sure you didn't just accidentally turn the toggle off for the address bar?
Go into "View->Toolbars" and make sure your address bar is checked off. If it's not, click on it, and it should return.
As far as bumping old threads...I dislike multiple threads on an issue as much as you do. But, that's mainly for an injury or commentary question. In here, it's not as big a deal to make new posts for questions such as yours providing there isn't an currently existing discussion in here.
If a thread is maybe a week or two old so that people would remember it, then using it is OK. But, when you take a thread from a year ago, it's a little too outdated to be bringing back. The main reason is because everyone will assume that this is a new thread and will read through the old material thinking that it is a new question. Then, people will post replies on the old stuff. Eventually someone will notice that it is old stuff and make note of it.