History button disappears.
I recently gave in and upgraded to the latest Firefox (3.6.3 specifically) after ages stubbornly sticking to Firefox 3.0. All in all upgrade has gone well. However, lately I find that the history button next to the url bar randomly disappears. It's easily restored by clicking "customize" on the navigation bar, but the fact this happens every few days has me somewhat flummoxed. Anyone have any ideas why this would be happening?
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Updating to a newer version may easily mess the toolbar configuration. You are suggested launching Firefox Diagnose Firefox issues using Troubleshoot Mode, and select “reset all the buttons from toolbar” then click restart Firefox. (I don't know what is exactly called in English version). And then, you will see all the buttons are restored to default settings. You may now re-drag-and-drop all buttons including your disappeared buttons in customize.