Programming Resources

YSlow is a Firefox add-on integrated with the popular Firebug web development tool. It analyzes web pages and tells you why they’re slow based on the rules for high performance web sites.
It features

Performance report card
HTTP/HTML summary
List of components in the page
Tools including JSLint

FFClickOnce is a Firefox extension that adds an extra option when you click on a link to a ClickOnce application.
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ClickOnce is a deployment technology that allows you to create self-updating Windows-based applications that can be installed and run with minimal user interaction.
A ClickOnce application is any Windows Forms or console application published using ClickOnce […]

SwitchProxy Tool  is a Mozilla tool you can use to organize all your proxies. You can add, edit and remove them from a single master list. When you need to use one, just select it from the list and click apply.

It also has an Anonymous Proxy feature. An anonymizer uses a list of proxies […]

Aardvark is a Firefox extension that can be used to

Clean up unwanted banners and surrounding “fluff,” especially prior to printing a page
See how the page is created, block by block
View the source code of one or more elements

The Pencil Project provides a free and open source tool for making diagrams and GUI prototyping.

As quoted from the website, it features

Built-in stencils for diagraming and prototyping
Multi-page document with background page
On-screen text editing with rich-text supports
PNG rasterizing
Undo/redo supports
Installing user-defined stencils
Standard drawing operations: aligning, z-ordering, scaling, rotating…
Cross-platforms
Adding external objects

It is released under GPL version […]

One thing I like about Firefox is the abundance of extensions out there which can do almost anything that you can think of.
Solvent is a Firefox extension that helps you write screen scrapers for Piggy Bank.
Piggy Bank is a Firefox extension that turns your browser into a mashup platform, by allowing you to extract […]