Firefox testing plugins

Firebug

Description: This tools gives you ability to change or disable parameters of HTML, CSS. It works like sniffer showing page resources load time, URLs and error code. It is Javascript debugger and DOM investigation tool. These capabilities could really help during web testing. The most powerful and usefull add-on.

Web developer

Description: More specific plug-in for editing HTML, CSS. This tool is covered by Firebug add-on, however it is more specific to web elements debuging. It contains DOM investigation. This tool helps uncover DOM structure, find element on the page and vise versa in the source. This add-on covers several browsers and has sister-tools with similar interface.

Link checker

Description: Easy tool that makes color selection of broken links. This tool help to find easily 404-error page links during simple web-site navigation or ad-hoc testing.

Tamper Data

Description: Great tool to perform security testing. It allows view detailed http requests and modify them. It is extremely useful to see back-end of web-application POST functionality. Application is analogous to Charles tool. Tamper data provides ability to see and modify all requests that page or application is performing. Extremely necessary in vulnurability verifications.

Flash Tracer

Description: Flash logger that gives ability to see any Flash errors and trace them in log file. It works with debug version of Flash player. Sometimes flash seems to be very slow or works inproperly. You could find issues and open bugs for developers. Important tool during flash web-sites verification.

Flash Blocking

Description: Tool allows to block flash content and unblock that with one click. Sometimes flash download could be very slow and is not necessary. This add-on increase productivity during large flashy web-site testing.

Firesizer

Description: It makes easier window resolution compatibility testing. Firesizer allows to resize Firefox window to specific dimenstions in one click. This tool set environment parameter "entire window". During compatibility testing one has to check a lot of different dimenstions on a large number of pages. This tool helps making this process easier and faster.

Add N Edit Cookies

Description: It makes possible to edit cookies and see how web-site will behave. During functional testing of web-sites it is necessary to see if cookies are saved correctly and modified if necessary. Using this add-on makes it possible.

URL Params

Description: It makes possible to analyze and change GET and POST parameters of the current website.

W3C Validator

Description: This tool help to validate the page using W3C Markup Validation Service. You may use the service itself by W3C Validation or get this add-on.

Accessibar

Description: This tool enable easy display modifications. Using it you could change the page definitely in several clicks.

MeasureIt

Description: Ability to measure any distance between elements, get width and height of every element on that page. Good pixel-counter tool.

FireShot

Description: Useful firefox extenstion for creating web pages screenshots. It provide editing and commenting.

View Dependencies

Description: Add-on to find all resources used in web-page like images, javascript, css or other files. This tool shows how much time it is necessary to download each item.

HttpFox

Description: Simple http sniffer tool. The interface is similar to HttpWatch, IEInspector, HTTP Analyzer. Add-on shows headers, query parameters, cookies, etc.

SQL Injection

Description: Easy and simple tool to test for SQL injection vulnurabilities in a web pages.

HackBar

Description: Plugin to perform security and vulnurability audit.

Regular Expressions Tester

Description: Testing tool for regular expressions testing and debugging.

XSS Me

Description: Plugin for cross-site scripting (XSS) testing. XSS is a vulnurability of website. Discovering on early stages avoid a lot of troubles.