SEOpen provides some basic tools to help with search engine optimization. Including google backlinks, yahoo backlinks, PageRank check, http header viewer, and more.
All features are available by right-clicking on an open area of a web page, or by using the included toolbar.
SEOpen is an extension I made for Firefox to help with search engine optimization. SEOpen provides many helpful tools at the click of a mouse.
Here are some key features of "SEOpen":
· Yahoo Backlinks
· Pages in Yahoo Index
· Google Backlinks
· Google Cache
· Pages in Google index
· Google Translate to English
· Google Related
· PageRank Check
· MSN Backlinks
· Pages in MSN Index
· Alexa Overview
· Alexa Traffic
· Alexa Related
· Alexa Backlinks
· "Mass Check" multiple sources at once
· Check DMOZ Inclusion
· Keyword Density
· Page Size Checker
· HTML Validator
· Server Header Viewer
· Wayback Machine
· Check robots.txt
· Whois Info
Requirements:
· Firefox 1.5 to 4.0.*
What's New in This Release: [ read full changelog ]
· Updated to work with Firefox 4.0.*
· PR Check is working again, at least until Google breaks it again.
Find us on Google+
Universal Binary 
