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SiteLauncher

http://lifehacker.com/5119906/sitelauncher-adds-keyboard-shortcuts-to-your-bookmarks All platforms with Firefox: The SiteLauncher extension adds a keyboard launcher for your favorite bookmarks in Firefox. Hit the extension's default launcher shortcut—Ctrl+Alt on my Mac, Ctrl+Space on Windows—then hit the key you see next to your bookmark of choice in the dark prompt panel shown below.

Better GReader

http://lifehacker.com/262020/trick-out-google-reader-with-better-greader Firefox only: Google Reader is one of the best web-based feed readers out there, but it could stand a few adjustments.
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

http://lifehacker.com/319925/better-youtube-firefox-extension
http://lifehacker.com/165512/download-of-the-day--tab-mix-plus

Tab Mix Plus

Yesterday we reported that several popular Firefox extensions leak memory , including Lifehacker favorite SessionSaver.

Centre National de Ressources Textuelles et Lexicales

Extension pour le portail lexical Cette extension permet l'utilisation du portail lexical du CNRTL directement depuis une barre d'outils installée dans le navigateur Internet Firefox. Elle offre également la possibilité de double-cliquer sur un mot de n'importe quelle page Web pour en obtenir ses informations lexicales. http://www.cnrtl.fr/outils/extension-portail/
All great webapps can stand a little tweaking, and Google Calendar's no exception. 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. Today Better Gmail's younger sibling is born.

Better GCal

http://lifehacker.com/260074/enhance-google-calendar-with-the-better-gcal-firefox-extension
http://www.lifehacker.com/software/exclusive-lifehacker-download/trick-out-google-reader-with-better-greader-262020.php Firefox only: Google Reader is one of the best web-based feed readers out there, but it could stand a few adjustments. Greasemonkey scripters have come up with a few Google Reader user scripts that make some welcome GReader tweaks like maximizing the viewing area, skipping Google's default subscribe mechanism, and adding keyboard shortcuts. Today I've rolled up those three useful scripts into a single Firefox extension, called Better GReader.

Better Greader

http://lifehacker.com/274396/upload-files-to-your-favorite-sites-with-fire-uploader

Fire Uploader

Windows/Mac/Linux (Firefox): The Firefox Uploader extension provides a universal interface for uploading files to popular web applications like Flickr, Box.net, Picasa, and YouTube (with support for more web apps in the works).
Windows/Mac/Linux (Firefox): The DocuFarm Firefox extension lets you preview any PDF, PowerPoint presentation, Word document, etc., from the comfort of your browser in all of its original formatted glory. After you've installed the Firefox extension, clicking on a direct link to a supported document type will automatically redirect you to the DocuFarm web site, where the document is very quickly downloaded to DocuFarm's servers and presented to you in a very cool thumbnail interface.

DocuFarm

http://www.lifehacker.com/software/featured-firefox-extension/preview-documents-in-your-browser-with-docufarm-262900.php