When we talk about Seo we talk first of all about the success of a webpage or a website. In order to measure it we can use a few factors: Google Pagerank, Alexa Rank, Number of backlinks,…
Alexa Sparky is the official addon from alexa. It displays the Alexa page rank and a small traffic trend graph in the status bar. Right clicking will pop-up a menu from where you can open Alexa Related pages: Traffic Stats, Related Links, Keywords,…

Alexa-Sparky
SeoQuake SEO extension SeoQuake is really useful plugin if you want to research and gather data about the first results on google SERP page. It adds using for each result in google page the PageRank, number of backlinks according to Google and Yahoo.

Seoquake
SearchStatus – Display the Google PageRank, Alexa rank, Compete ranking and SEOmoz Linkscape mozRank in status bar and provide a popup menu to open pages on useful pages on google, compete.com, alexa and seoMoz.
SearchStatus
Keywords are the real tags of a webpage through the web. Search engines are indexing webpages and websites based on their keywords. On the other side potential visitors perform searches based on keywords. Keywords are the core of the web search.
Seo Blogger is a extension from wordtracker that be be extremely useful for doing a keyword research. The main benefit is the fact that it is integrated in the browser so it’s more useful that keywords tool from google. There is also a drawback, wordtracker keywords research is done on less than 100% of all the searches, so the accuracy can not be even compared with the keywords research tools from google.
Wordtracker-Seoblogger
KGen – display the keywords in a webpage ordered by weight and importance.

KGen
Sometimes it’s important to find out where a specific site is located, who is the owner of the domain, what type of webserver is used,…
FlagFox – display an flag icon near the address bar, showing where the site host server is located.

FlagFox
Domain Details is a more advanced plugin. It can display the country location of the server, type of server and header information.

Domain Details
Web Developer is a very complex addon for web developers. You can use it for seo to perform all kind of tasks: Hide the images to see the titles, disable css to see how serach engines sees a page, display title attributes,…
Firebug is another tool for web developers, that can be used by seo professionals as well. You can use it to inspect html elements or to use the page speed plugins that will be described in the next section.
Page loading speed is an important seo factor that is very often ignored. If the page doesn’t load in less than a few seconds you’re gonna lose almost half of the visitors.
YSlow – is an addon created by yahoo, which works in firebug and records the loading time of each component and shows a list of suggested improvements that can be made.
PageSpeed – is the google clone of YSlow. It works in the same manner and usually the suggestions that are made are the same.
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