Kolja Schönfeld's Library tagged Addon →  View Popular, Search in Google

Preview web pages inline in Google Reader, collapse the header and sidebar for more reading area, get a Mac OS X like skin, add favicons to feed subscriptions and more with Better GReader.

Firefox AddOn free Google Reader Greasemonkey addon

Now Playing X allows you to use MSN or Live Messenger’s “Show what I’m listening to” feature with services like YouTube.

Other supported instant messaging (IM) clients are: AOL Instant Messenger AIM, Google Talk, Skype and Yahoo! Messenger

Firefox free Video instant messenger web2.0 addon

This is a must-have addon for all video-site fans!
YouPlayer is a video player with playlist similar to Winamp. You may add/drag a video link into the playlist and watch it or download it.
Currently supported sites: Google Video, MetaCafe, MySpace and YouTube. You may now even drag local files from hard drive into playlist and watch them!

Video Player Firefox AddOn free addon

Feedly integrates Twitter and Google Reader into a fun magazine-like experience.

Firefox Twitter Google Reader free AddOn addon

If you love Google* Docs, and need a better way of searching, sorting your docs from right within firfox, then gDocsBar is the solution you've been dreaming of. gDocsBar is a Firefox sidebar where you can drag and drop files to upload, and upload multiple files simultaneously. You can also sort, filter and search all your documents from with in the sidebar.

Firefox AddOn free Google Docs addon

Adds collapsible header and sidebar, event title text wrap, colored weekend days, week numbers, and skins to Google Calendar.

Firefox free AddOn Google Calendar Greasemonkey addon

This Firefox addon enables fast navigation of google results, while still retaining the google "feel". Navigate the results using the mousewheel, and mouse over a result to display it in a window to the right. Try it, it's fast and fun!

Firefox AddOn free google addon

AddOn Blog Firefox tools addon