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SEO for Firefox Features:

Pulls useful market research data right into Google's and Yahoo!'s search results, including the following data near each search result.

    * PR: (Google PageRank) an estimated measure of global link authority
    * Age: age pulled from Archive.org, shows the first time a page was indexed by Archive.org's spider. The theory is that if Archive.org found a page so did many of the major search engines.
    * Links: (Yahoo! linkdomain) shows a rough estimate of the total number of links pointing at a domain
    * .edu Link: (Yahoo! .edu linkdomain ) shows a rough estimate of the total number of .edu links pointing at a domain
    * .edu Page Link: (Yahoo! .edu link ) shows a rough estimate of the total number of .edu links pointing at a specific page
    * .gov Link: (Yahoo! .gov linkdomain ) shows a rough estimate of the total number of .gov links pointing at a domain
    * Page Links: (Yahoo! link) shows a rough estimate of the total number of links pointing at a page
    * del.icio.us: number of times a URL has been bookmarked on Del.icio.us. Heavily skewed toward techy / Web 2.0 stuff.
    * Technorati: an estimate of the total number of links to a site from blogs
    * Alexa: rank based on website traffic . Heavily skewed toward internet marketing and webmaster related resources.
    * Cached: (Google site:) shows how many pages from a site are indexed in Google
    * dmoz: searches the Google Directory to count the total number of pages from a site that are listed in DMOZ, and the total number of pages listed in DMOZ that reference that URL.
    * Bloglines: shows you how many people are subscribed to a particular blog via Bloglines.
    * dir.yahoo.com: is a site listed in the Yahoo! Directory or not.
    * WhoIs: makes it easy to look up the whois data for any site.