SEO's Toolbox

by Nico Steiner

17 Add-ons in this Collection

Firebug by Joe Hewitt, Jan Odvarko, others

Rated 4 out of 5 stars 2,448 reviews

1,173,894 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 4 out of 5 stars 408 reviews

305,096 users

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

Flagfox by Dave G

Rated 5 out of 5 stars 753 reviews

293,912 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...

SeoQuake SEO extension by SeoQuake Team

Rated 4 out of 5 stars 233 reviews

34,613 users

Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.

Html Validator by Marc Gueury

Rated 4 out of 5 stars 211 reviews

33,174 users

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

For Firefox 56, use 0.974 (see all versions below).
For Firefox 57, see Web Extensions.

Live HTTP Headers by Daniel Savard, Nikolas Co

Rated 4 out of 5 stars 192 reviews

86,978 users

View HTTP headers of a page and while browsing.

YSlow by YSlow

Rated 3 out of 5 stars 208 reviews

33,924 users

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

LinkChecker by Kevin Freitas

Rated 4 out of 5 stars 84 reviews

11,183 users

Check the validity of links on any webpage.

ShowIP by Anonymous user f5ac7e

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Experimental

Rated 3 out of 5 stars 280 reviews

19,749 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 194 reviews

8,953 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.

Fangs Screen Reader Emulator by Peter Krantz

Rated 5 out of 5 stars 10 reviews

2,731 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.

Accessibility Evaluation Toolbar by Jon Gunderson

Rated 4 out of 5 stars 16 reviews

2,759 users

Support web developers in testing web resources for accessibility features.

SenSEO by Nico Steiner

Rated 4 out of 5 stars 43 reviews

2,625 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.

Live PageRank by Martin

Rated 3 out of 5 stars 55 reviews

320 users

Display PageRank for active URL...

KGen by Nicolas Froidure

Rated 4 out of 5 stars 29 reviews

2,026 users

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