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The Firefox version doesn't include all the features that are available in Google Toolbar 5 for IE: there's no find bar, pop-up blocker, Browse by Name because Firefox already has these features. Customizable layouts, highlighting search terms, Word Find and Google Docs integration are the four Firefox-only features.
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If you use Google Toolbar on multiple computers, enable synchronization to save AutoFill profiles, custom button and other settings to a Google account. Since bookmarks and notes are saved to the same Google account, you'll see the same Google Toolbar anywhere you go.
Google Toolbar 5 for Firefox - http://www.google.com/tools/firefox/toolbar/FT5/