Need help fixing bookmarks. They show but no longer work, and Search feature no longer working.

All of a sudden my bookmarks are no longer working. (I have many, so keep them in a panel on the left side of my screen.) First, tried to search bookmarks for a specific shortcut: Typed in name. Nothing appears. Then, I scrolled through my list of bookmarks to manually find the one I wanted. Clicked on tha bookmark, but nothing happens. Website doesn't open. Tried several others, too, still nothing happens. None of the bookmarks are functional. Tried going out of FF and coming back in. Didn't help. Tried rebooting computer and coming back in. Didn't help. Anyone else having this problem or can tell me how to get bookmarks working again? Thanks!