SEO's Toolbox

by Nico Steiner

17 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 5 out of 5 stars 1,800 reviews

2,704,207 users

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...

Web Developer by chrispederick

Rated 5 out of 5 stars 218 reviews

638,054 users

The Web Developer extension adds various web developer tools to the browser.

Flagfox by Dave G

Rated 5 out of 5 stars 636 reviews

655,173 users

Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 159 reviews

186,874 users

View HTTP headers of a page and while browsing.

YSlow by YSlow

Rated 3 out of 5 stars 200 reviews

114,787 users

YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. is the official open source website.

SeoQuake SEO extension by SeoQuake Team

Rated 4 out of 5 stars 208 reviews

91,876 users

Seoquake is a Firefox SEO extension aimed primarily at helping web masters who deal with search engine optimization (SEO), social media optimization (SMO) and internet promotion. Seoquake allows to investigate many important SEO parameters.

Html Validator by Marc Gueury

HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla. The number of errors of a HTML page is seen on the form of an icon

For Online HTML 5 validation, you need 0.962

ShowIP by ShowIP Dev Team

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Rated 3 out of 5 stars 285 reviews

71,761 users

Show the IP address of the current page in the status bar. It also allows querying custom information services by IP (right click) and see location and avaiable vouchers for shopping sites. Additionally you can copy the IP address to the clipboard.

SearchStatus by Craig Raw

Rated 4 out of 5 stars 190 reviews

27,838 users

Display the Google PageRank, Alexa rank, Compete ranking and SEOmoz Linkscape mozRank anywhere in your browser, along with fast keyword density analyser, keyword/nofollow highlighting, backward/related links, canonical links, WHOIS, robots and more.

LinkChecker by Kevin Freitas

Rated 4 out of 5 stars 77 reviews

19,617 users

Check the validity of links on any webpage.

Accessibility Evaluation Toolbar by Jon Gunderson

Rated 3 out of 5 stars 15 reviews

8,185 users

Support web developers in testing web resources for accessibility features.

Fangs Screen Reader Emulator by Peter Krantz

Rated 5 out of 5 stars 10 reviews

5,504 users

Fangs renders a text version of a web page similar to how a screen reader would read it. The ambition is to help developers understand how an assistive device would present a website and thereby increase chances of finding accessibility issues early.

SenSEO by Nico Steiner

Rated 4 out of 5 stars 41 reviews

7,803 users

SenSEO is an extension checking the most important on-page-SEO-criteria and calculating a grade of how good your site fulfills these criteria.

KGen by Nicolas Froidure

Rated 4 out of 5 stars 27 reviews

6,508 users

KGen (Keyword Generator) allows you to see what keywords are strong on visited web pages for search engines.

Operator by Mike Kaply

Rated 3 out of 5 stars 36 reviews

2,772 users

Operator leverages microformats and other semantic data that are already available on many web pages to provide new ways to interact with web services.
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