I have used the reset preferences option. I had to recreate all items I previously had in the toolbars. And had to "Add a New toolbar" and add the items i had in that, also. I also used the fix for a corrupt local.rdf file. No joy. At first I did not know why I was losing my custom toolbar. But I started paying extra attention and found out how to recreate the problem. I f a link opened a new window it opened without the custom toolbar. If I closed that window before closing the original window the custom settings where maintained. If I opened a new window or selected a opened tab to open or duplicate in a new window the custom toolbar was gone. Again, if I closed the "new" window b4 I closed the original window all was good. But if I close the original window and the the new window the next time I open firefox the custom toolbar is gone. Righting clicking on a clear spot of a toolbar to open the "Customize Toolbar" dialog the name of my custom created toolbar is missing also. Firefox info from the "About" section says Firefox 18 Funnelcake Oct 2012 mozilla17-1.0 I have never had this problem with FF before. I did not post asking for help until I could recreate the problem so that I could tell you when it happened.