Extension for Safari to replace Google+ Profiles in Google search results with the most relevant social profiles

I actually didn’t know a lot about tracking myself, so I whipped up a Firefox add-on called Collusion to help me visualize it better. The results were a little unsettling.

I’ve put a demonstration up at collusion.toolness.org, which takes you through five popular websites and visualizes the data collection companies that track you across them. From there, you can download the add-on if you want to see the tracking visualization of your own browsing behavior evolve in real-time.

Pure Reader and Pure Flickr extensions.

Looking for ways to augment Safari 5? These extensions are the most useful we’ve found

Jetpack is a Mozilla Labs project that enables anyone who knows HTML, CSS, and JavaScript to create powerful Firefox add-ons. The Jetpack Gallery is a community for developers and add-on users: Users get innovative add-ons that add functionality to Firefox, while developers receive valuable feedback and visibility in the Jetpack community.

When you visit a web site how do you know you're getting the best experience for you? That's the question the new Firefox add-on App Discover aims to solve. Once installed, the app could alert you if there were any enhancements (Greasemonkey, Firefox add-ons) or applications (Adobe AIR, Appcelerator Titanium, Fluid, Mozilla Prism) that work with the web site you're visiting.

AutoSend Unsent Messages. Flushes entire outbox at regular intervals.

Firefox Plugin: The Drag & Drop.io - create drops and post files with just a flick of the wrist

This Firefox extension allows you to save pages of interest to read later. It eliminates cluttering of bookmarks with sites that are merely of a one-time interest. A commenter below (Chris) summed it up very well: “It’s a ’staging area’ for bookma

NoSquint is a Firefox extension that allows you to adjust the default text zoom level, which is very useful if you have a small display or run at a very high resolution. NoSquint also remembers the zoom level per site (though you can disable that)

Enhances YouTube with Greasemonkey user scripts, that offer options like the FlowPlayer "doesn't start till you hit play" viewer, clean "theater" view, higher res videos, and links to download the video automatically.

Watch YouTube videos more efficiently with Better YouTube, a brand new Firefox extension that compiles our favorite YouTube Greasemonkey scripts into a single convenient package. Better YouTube smartly enlarges videos for better viewing, hides user commen

Firefox sometimes gets a bad reputation for crashing or locking up when a plugin such as Adobe Flash or Windows Media Player causes a problem. This project aims to solve this issue by adding code to Firefox such that when a plugin misbehaves, a dialog is

Prism is an open source cross-platform prototype of functionality that lets users split web applications out of the browser and run them directly on the desktop.

PicLens instantly transforms your browser into a full-screen, 3D experience for viewing images on the web. Photos will come to life via a cinematic presentation that goes well beyond the confines of the traditional browser window. With PicLens, browsing a

"The OpenOffice.org2GoogleDocs extension imports documents from Google Docs and Spreadsheets to OpenOffice.org and exports from OO.org to GDocs so you can work with your docs both online and off as you see fit."

Zotero [zoh-TAIR-oh] is a free, easy-to-use Firefox extension to help you collect, manage, and cite your research sources.

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

Extend Basecamp Project Management with this time saving firefox extension.

Post to Twitter from your Firefox address bar

Functionalities : Replace the stream by a simple button. Works with RealMedia, QuickTime and WindowsMedia streams. Allow the use of any capable media player. Support Media Metafiles (ram, rpm, wmv, wm, wma, asx, asf, ...). Etc...

Links the Lightning Calendar extension for Mozilla Thunderbird to Google Calendar, enabling editing of your web calendar from your desktop.

# Glubble Trusted Surfing for children under 12 years of age enables families to be sure they only see the best of the web they choose to allow. # Glubble Altered Search makes Google and Yahoo show results from childrens trusted Glubbleworld instead of th

Everyone's favorite photo-sharing web application, Flickr, has had tons of ancillary applications and user scripts developed for it to tweak, mod and add to its functionality. Dozens of Greasemonkey user scripts have popped up that make Flickr better; so

"To save you the time, I've compiled the best Greasemonkey scripts for Gmail into one handy Firefox extension, called Better Gmail."

"Javascript hackers have come up with some great Greasemonkey user scripts that make GCal easier to use, so I've compiled a few of my favorites into a single Firefox extension."

Thunderbird is the ultimate open source desktop email app. Its pluggable interface lets developers freely build extensions to make it ever more useful. And ever more useful do a few key extensions make it.

Google Browser Sync for Firefox is an extension that continuously synchronizes your browser settings – bookmarks, history, persistent cookies, saved passwords. It also allows you to restore open tabs and windows across different machines/sessions.

The Duplicate Tab Firefox extension allows you to clone a tab with its history and place the duplicate tab in a new window or in the current window. And it allows you to merge all tabs from different windows in one window.

Sxipper is a free plug-in for Firefox that lets you log into any website with a single click. Sxipper saves you time by keeping track of all of your user IDs, passwords, and the personal data you share every day over the web. Sxipper logs you in securely