Firefox and IE use different systems to create toolbars, you can not import IE toolbars into Firefox, you will need to see if the developers of the toolbars for IE have also created a version for Firefox.

Favorites imported from IE should appear in a folder called "From Internet Explorer" inside the Firefox bookmarks. For more details see https://support.mozilla.com/kb/Importing+favorites+and+other+data+from+Internet+Explorer

In Firefox 4 you can press F10 or use "Firefox > Customize" to make the Menu Bar and other toolbars visible and remove the check-mark on "Tabs on Top" to place the tab bar in the old position.
You see the orange (on Linux gray) Firefox button if the Menu Bar is hidden (View > Toolbars > Customize or right-click a toolbar).
If you need to access the hidden Menu bar then press F10 or hold down the Alt key to make the Menu Bar appear temporarily.