"Detox is a tiny Safari extension that automatically expands shortened t.co links on the Twitter site"

DOMCrypt is a Firefox extension that adds 'window.crypt' to each browser window. With 'crypt', you can generate a public and private key pair, encrypt data and decrypt data. All of the encryption operations are handled by low-level NSS libraries written in C. This is not a javascript-in-content solution. (NSS handles all of the SSL operations in many modern browsers.)

"Set of plugins and improvements to make Gedit a powerfull programmer text editor"

"Incognito is a Safari extension that prevents Google and Facebook from following you on the web."

I was going to write this myself, yay.

seems hacky...

"TamperData is an extension to track and modify http/https requests."

"Strip stupid junk (placed there by feedburner) from end of links opened from Google Reader."

"JSONView is a Firefox extension that helps you view JSON documents in the browser."

"dentify is a Firefox extension that combines identities across various social network/media sites and provides you with a profile about an individual. Simply navigate to the profile page or a blog of an individual you are interested in and press Alt i."

Mobile user-agent simulation as a Firefox extension. Doesn't work with Firefox 3.1+, yet.

"The AutoPager Firefox extension automatically loads the next page of a site inline when you reach the end of the current page for infinite scrolling of content." Hard to say what I think about this. Paginated articles are a real chore on the web but Infinite Scrolling is such a PITA.

"Wingman validates pages directly from your browser. So, you don't need to submit your pages manually to an external site. ... Most validators are (by definition) pedantic. We've designed Wingman to be more human. When you encounter errors that you're prepared to live with you can choose to ignore them. And Wingman will remember."

Gez Lemon continues to update his Mozilla extension with additional ARIA support: "The properties functionality is a catch-all to report all ARIA properties. The toolbar can highlight live regions, document landmark roles, and general roles individually."

Daniel Glazman's company ported IE8's "web slices" feature to Firefox... it wasn't immediately clear to me from the description if this meant that an existing "web slice" would just work with WebChunks or not...

Hrm: "With the new browser plugin from SpinSpotter, you can edit and share any sign of bias on the web." Curious to see if it works, my gut says the "spin makers" will abuse this tool.

"The script is designed to import a whole folder of files into mediawiki, with the folder directory tree mapped as wiki category hierarchy."

" The Pencil Project's unique mission is to build a free and opensource tool for making diagrams and GUI prototyping that everyone can use." It is a Firefox 3 extension

"Jiffy is an end-to-end real-world web page instrumentation and measurement suite." Includes a Firebug extension. Hooottt

Uses PDFKit to display PDFs in Firefox 3/OS X 10.4+

BrowserPlus™ is a technology for web browsers that allows developers to create rich web applications with desktop capabilities.

Operator leverages microformats and other semantic data that are already available on many web pages to provide new ways to interact with web services.

"Slogger is an Extension for Mozilla Firefox web browser. It is a very flexible tool for creating a complete log of your browsing history"