why don't i have a search bar?
Bring up the View menu and place a checkmark against Toolbars you are missing, include the Menu Bar to make it easier to work with.
Do you see your search bar now, if not ...
Please mark "Solved" one answer that will best help others with a similar problem -- hope this was it.
You can make Firefox 6.0.2 look like Firefox 3.6.*, see numbered items 1-10 in the following topic Fix Firefox 4.0 toolbar user interface, problems (Make Firefox 4.0 thru 8.0, look like 3.6). Whether or not you make changes, you should be aware of what has changed and what you have to do to use changed or missing features.