Do you want to write an extension or some Custom Buttons code ?

First page to visit should be:
Mozilla Developer Center contents

Proxomitron.Info ...the Webhiker's Guide to Proxomitron.

I use the config from:
sidki | proxomitron
Ask and read Sidki about Proxomitron

German users should read this:
Der Proxomitron - Ein Universeller Web-Filter : Eingangsseite

It would be cool to have a module for documenting an own setup.Maybe this should be implemented in the profile generator.But you can show all enabled modules with 'Used modules'.

Winspector - Ultimate Programmers Window Spy Utility Have you ever used Spy++ that comes with MSVC? If you have then you know what Winspector is - but take out all of theannoyances of Spy++ and add in a big bag of handy tweaks and features.

VectorMagic - Precision Bitmap to Vector Conversion Online

Test your web design in different browsers

Browsershots makes screenshots of your web design in different browsers.
It is a free open-source online service.

http://browsershots.org/

How to fix the 'sec_error_untrusted_issuer' error.

Double left click on a free area in SysListView32 to navigate up
in the directory tree.

The PHP Classes Repository site is a very nice resource.
PHP scripters from all around the globe distribute solutions.

PHP Classes - Welcome to the PHP Classes Repository

Umibozu is a cross-platform wiki-based photo album generator, designed to facilitate publications and updates
of photos on the web.

Umibozu - wikify your web album