A plugin for Selenium-IDE to highlight elements used in the Selenese commands
SenSEO is an extension checking the most important on-page-SEO-criteria and calculating a grade of how good your site fulfills these criteria.
A plugin for Selenium-IDE to improve debugging and troubleshooting issues with scripts
Server Spy indicates what brand of HTTP server (e.g. Apache, IIS, etc.) runs on the visited sites.
Pencil is a Firefox add-on to do GUI prototyping and simple sketching
PHP code formatters for Selenium IDE.
Created by Adam Goucher.
CSS Reloader is an extension that allows you to reload all the CSS of any site without you have to reload the page itself.
Checks for compliance with the contrast levels, brightness and shine in the color combination of foreground and background of textual content based on the requirements of WCAG 1 and WCAG 2.
Open in a sidebar or in a tab and write headers directly. Simplicity, JS substitution, built-in functions, encryption, and regexp support.
You can easy modify header on each HTTP call on the Mozilla Firefox.
Stop searching at PHP.net to simply remember some function signature. With this addon you can search functions quickly for the official function description directly into your browser without a new tab.
Plus, many tools to help PHP developers.