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SEOpen

Provides quick access to some web-based tools to help with search engine optimization. Quickly check inbound links, PageRank, http headers, and much more. Right-click on an open area of a web page, or use the included toolbar.

Rated 4 out of 5 stars (18)
1,405 users

Seoptimer.com - SEO Audit No Restart

Seoptimer.com is an on-line tool for on page SEO analysis.

Not yet rated
674 users

SeoQuake SEO extension

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.

Rated 4 out of 5 stars (207)
82,374 users

SEOwarp Keyword Rank Checker

SEOwarp Keyword Rank Checker And Page Analyse Tool. You can learn Your SERP Positions and make some analyses of page speed and SEO.
Also it says
page rank
google+, twitter and facebook counts
Alexa Rank Of web sites in url

Not yet rated
94 users

Separated Values Formatter

A plugin to add a separated values formatter to Selenium-IDE

Not yet rated
287 users

sepsis-console (Deprecated)

THIS VERSION IS DEPRECATED. Use https://addons.mozilla.org/en-US/developers/addon/sepsis-console instead. See the description below.

sepsis-console is a general-purpose JavaScript console for all Mozilla toolkit applications.

Not yet rated
3 users

sepsis-inspector

A general-purpose inspector for all Mozilla toolkit applications.

Not yet rated
4 users

SERPTrends SEO Extension

SEO Extension SERPTrends for Firefox is a lightweight SEO tool which shows dynamics for the search results within the search page: whether the website moved up, down in the SERP, just appeared (is "new") or hasn't changed its position.

Rated 5 out of 5 stars (2)
2,182 users

Server Spy

Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites.

Rated 4 out of 5 stars (16)
6,946 users

Server Switcher

Easily switch between your development and live servers.

Rated 5 out of 5 stars (47)
1,398 users

ServerButton

Connect to remote servers with one click by running external commands depending on the webpage open in current tab.

To get started, check the command configuration and add the toolbar button to a toolbar of your choice.

Not yet rated
6 users

ServerReplace

Need to open the same page on different servers (e.g. your development server, QA, Production)? This plugin replaces the server in the current URL with the server from a bookmark on the bookmark toolbar if you hold ALT+CTRL while opening...

Rated 4 out of 5 stars (4)
2 users

ServStats

ServStats lets you share statistics about web server connectivity and diagnose network failures. When a network failure occurs, ServStats automatically conducts diagnostic tests and infers the most likely cause of failure.

Rated 1 out of 5 stars (2)
11 users

Session Keeper

Keep a (longer) session with one Web Application that has an inactivity timeout...

Rated 4 out of 5 stars (24)
2,592 users

Set proxy server with one click! No Restart

Set proxy server with one click! Visit Cool-proxy.net, the best resource of proxy servers and set your browser with one click.

Not yet rated
277 users

Set UA to 9 No Restart

This addon overrides your useragent string to be one that uses a single-digit version number (version 9.0.1) to help test bad sites. Disabling or removing the addon resets the UA string to normal.

Rated 5 out of 5 stars (1)
85 users

setproxy No Restart

This can be used to set or reset any proxy server address with default port 443 for your browser.

Not yet rated
4 users

ShareMyLink No Restart

Your current link is stored in a offline file. Can be used in other web applications

Not yet rated
1 user

Sharepoint Administrator's Toolbar

A Toolbar for aiding Sharepoint Administrators by putting the most common navigational commands at the point of their mouse. Supports navigation in both regular firefox tabs as well as IEtab2 and IEtab+. It works for Sharepoint 2007 and 2010.

Not yet rated
708 users

Sharp Color Picker No Restart

A full featured color selector tool, to work with colors, and easily find the colors you want.

Not yet rated
1,587 users