Taken from SearchStatus website: "SearchStatus is a toolbar extension for users of both Mozilla and Mozilla Firefox, designed for the highly specialised needs of search engine marketers. The toolbar provides extensive search-related information about a site, all conveniently displayed in one discreet and compact toolbar." There you have it. A toolbar that displays both Google Page Rank and Alexa Rank, and shows you a lot of details for search engine marketing purpose.

Fig 11. Google Page Rank for Yahoo

The above image shows an example of both Google and Alexa ranks for Yahoo presented as a progress bar.

Fig 12. Looking for indexed page of a website

You can also see backlinks and indexed page of a website on the top 3 search engines: Google, Yahoo, MSN. Just right click on the round icon next to the Page Rank, and select the option as shown in Fig 12.

This extension is a good alternatives to Google Toolbar, which obviously only shows Google Page Rank, if you don't want the bells and whistles that come with Google Toolbar.