Firefox Bookmarks Toolbar Disappeared

Where did it go? I came home yesterday, and I was in front of my PC, but my bookmarks toolbar wasn't there! Anyway all the bookmarks was still there and they were functioning. Maybe an addon problem? I use FireFox Synchronizer and it manages my bookmarks. Probably it cause the problem, but i don't know exactly. I'm just guessing.

Anyway I cleaned my cache and it was all back again!