Did you try go to View >> Toolbars >> Bookmarks Toolbar?

Victor, I did, there are no ways to restore the Favorites Toolbar in the upper left side of the screen through VIEW. I even uninstalled and reinstalled Firefox with no results.

Check if it is in the customize window:

• Customize toolbars

Click on View >> Toolbars >> Customize , inside the customize window look for your bookmarks toolbar.

Maybe your localstore.rdf are corrupt, first unhide the hidden files and folders, then try go to your profile:

• http://kb.mozillazine.org/Show_hidden_files_and_folders
• Profiles

Close Firefox and delete the localstore.rdf, restart FIrefox

Or try create a new perfil:

• Create a new profile

Also:

• Firefox in safe mode
• Reset Firefox

Use Toolbar Layout (Customize) to open the Customize window and set which toolbar items to display.

• check that "Bookmarks Toolbar items" is on the Bookmarks Toolbar
• if "Bookmarks Toolbar items" is not on the Bookmarks Toolbar then drag it back from the toolbar palette into the Customize window to the Bookmarks Toolbar

• if missing items are in the toolbar palette then drag them back from the Customize window on the toolbar
• if you do not see an item on a toolbar and in the toolbar palette then click the "Restore Default Set" button to restore the default toolbar setup

What I lost is the ability to have a toolbar, not items in it. Usually, when I move the cursor to the top left side of the screen the Toolbar menu opens ; and from there I pick the site I want to open. That toolbar icon is not there anymore; that icon is the one I need; it suddenly disappeared. What I have there now is the Firefox logo and if I open it a "Hide Toolbar" message comes up. No results using it.

Make sure that you do not run Firefox in full screen mode (press F11 or Fn + F11 to toggle; Mac: Command+Shift+F).

• https://support.mozilla.org/kb/how-to-use-full-screen

If you are in full screen mode then hover the mouse to the top of the screen to make the Navigation Toolbar and Tab bar appear.
Click the Maximize button (top right corner of the Navigation Toolbar) to leave full screen mode or right-click empty space on a toolbar and choose "Exit Full Screen Mode" or press the F11 key.

Thanks to all who cared and tried to help me, really appreciate it.

Well, as it went away the Toolbar just returned. Dont know how, but I got it back.