Firefox is not saving new tool bar.

I've spent hours today making a Buttons Bar for special navigation and performance buttons It originally shows up on the Tool Bar drop down menu. When I close and reopen Firefox the Button Bar toolbar disappears forever. It also disappears when I reload a page. It is no longer on the toolbar drop down. I've re-downloaded and reinstalled Firefox and have redesigned the Button Bar 8---yes,, 8---times. And I hate looking for and drag and dropping buttons for hours at a time. How do I develop a toolbar that stays with my Firefox Browser. I've used FF for over ten years, and never have had this problem.