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It also makes all these settings be site-specific, so when you set a preference for any of the settings (whether via the sidebar or via the traditional UI in the View menu), Firefox will remember that preference for the site you're browsing and apply it the next time you visit that site.
You can also add widgets for modifying these preferences to your browser toolbars via standard toolbar customization (context-click on a toolbar and select "Customize..." from the context menu, then drag and drop one or more of the preference widgets from the palette to your toolbars).
To use this extension, install it, restart Firefox, then select View > Sidebar > Content Preferences.
Thanks to Mark James for the "undo" icon, which comes from his Silk icon set: http://www.famfamfam.com/lab/icons/silk/
* "this._widget is null" exceptions in the Error Console
* "observers is undefined" exceptions in the Error Console
* setting a character encoding preference for about:config causes it to reload endlessly (the character encoding preference has been disabled for about: URLs)