User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20040913 Firefox/0.10 StumbleUpon/1.998 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20040913 Firefox/0.10 StumbleUpon/1.998 By going to View->Toolbars->Customize, and moving the piece representing the "bookmarks toolbar" from the bookmarks toolbar up to the Menu toolbar, with no sites in the bookmarks toolbar folder, the rendering of Firefox SHAKES. This goes away if I close all the tabs, but will come back, likely from resizing. I have "flexible spaces" on both sides of the bookmarks toolbar item, and this only occurs when I have no items in the folder. A possible cause for this is the presence of two "flexible space" items with nothing separating them? Not sure what else the problem could be, or how important this bug is (given the rarity of this scenario). Reproducible: Always Steps to Reproduce: 1.Clear all bookmarks from the "bookmarks toolbar folder." 2.Click on View, toolbars, customize. 3.Click on the "Bookmarks Toolbar items" item, and drag it up to the menu toolbar (next to File... Help) 4.Close the dialog and you should see the bug manifest itself. Actual Results: The screen shook, vertically. Contents of the screen changed location rapidly from top to bottom. Expected Results: Not shaken, rendered normally.

*** This bug has been marked as a duplicate of 247116 ***