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Rated 4 out of 5 stars
Well, I'm not sure what you mean by "good", but there are a lot of restartless add-ons with settings.
URL Fixer, User Style Manager, Places Maintenance, KillSpinner, but I'd suggest you to take a look at Instant Fox and Location Bar Enhancer and maybe Glass My Fox if you like the settings to be shown inside AOM, not in a separate window.