Firebug Lite provides you with the same inspections capability that regular Firebug does. You can click the Inspect button and hover over sections of the page to view the computed style and DOM properties for the tag selected.
How to Install Firebug on IE, Safari, Chrome or Opera
or “Firebug Lite Bookmarklet” tool by right clicking on this Firebug Lite Bookmarklet link and add it to your favorites or bookmarks. So, when you need to use the Firebug Lite just open new windows and load the bookmarked link.