Yes O-P, lots and lots of extensions, although I had only very few installed when I starting experiencing the problem. The way I set up my Firefox toolbars is 1) I install the DragnDrop Toolbar ext. This allows me to move toolbars. 2) Then I create another toolbar, label it Toolbar 1, drag it below the Navigation toolbar, and populate it with the url bar and the search toolbar. 3) As I add extensions I periodically stop to drag their icons to both the Navigation toolbar and the Menu bar. Icons with drop-down menus generally go on the menu bar. 4) I employ a two tier bookmark toolbar using the MultirowBookmarksToolbar extension to house folders containing my 20,000+ bookmarks, and then hide them with the Bookmark Autohider extension. When my icons and toolbars started going askew after doing a Firefox restart I got frustrated and turned my computer off for a while. When I returned, turned on my computer, and reopened Firefox all my toolbars and icons were in the right place. I haven't seen any instability since. It's very strange.