Googlebar Options: Open the configuration menu.Site Search: Search the currently active website for the phrase entered in the search form.Did open Google Argentina for me, which was kinda strange. Google Search: Open the Google search page.Google Search form: Enter a search term and search on one of Google's search engines (web, images, groups and a dozen more).Lets take a closer look at what the Googlebar has to offer (from left to right):

For Pagerank, there are better alternatives available like the excellent SearchStatus extension. The latter is supported by the Firefox web browser natively which means that only one feature is not really supported by Firefox after installation. It replicates all features of Google's original toolbar with the exception of the following two features: Pagerank and Form Filling. Googlebar is a Firefox toolbar that might work as a replacement, at least for some Google Toolbar users. Eventually though some or all of the functionality may stop working, for instance when Mozilla makes changes to Firefox or Google to their APIs used by the extension. What can Firefox users do if they want to retain the functionality? They could try and force compatibility which may work for a while.

The last version officially supported is Firefox 4 which means that users who have not upgraded yet can install it in that version of the browser. The most recent version of the Firefox web browser, Firefox 5, is not supported anymore and the same is true for future versions of the Internet browser. We have discussed Google's decision to stop updating its Google Toolbar extension for the Firefox web browser previously.

Official google toolbar for firefox