Developer-centric plugins for Mozilla Firefox
List of useful developer-centric plugins for Mozilla Firefox:
Web Developer
Adds a menu and a toolbar with various web developer tools.
XML Developer Toolbar
Toolbar modeled after Chris Pederick’s WebDeveloper toolbar, that allows XML Developer’s use of standard tools all from your browser.
Firebug
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.
Live HTTP Headers
View HTTP headers of a page and while browsing.
View dependencies
View Dependencies adds a tab to the Page Info window, in which it lists all the files which were loaded to show the current page.
Add N Edit Cookies
Cookie Editor that allows you add and edit session and saved cookies.
Tamper Data
Use tamper data to view and modify HTTP/HTTPS headers and post parameters.
Javascript Debugger
Venkman is the code name for Mozilla’s JavaScript Debugger. Venkman aims to provide a powerful JavaScript debugging environment for Mozilla based browsers.
Selenium IDE
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests. Selenium IDE includes the entire Selenium Core, allowing you to easily and quickly record and play back tests in the actual environment that they will run.
MeasureIt
Draw out a ruler to get the pixel width and height of any elements on a webpage.
ColorZilla
Advanced Eyedropper, ColorPicker, Page Zoomer and other colorful goodies.
IE Tab
This is a great tool for web developers, since you can easily see how your web page displayed in IE with just one click and then switch back to Firefox.
Html Validator
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox and Mozilla.