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If you combine the compactness of mobile Twitter client with keyboard shortcuts and some magic, you get Twitica Desktop

Quix is an extensible bookmarklet, that allows you to easily access all your bookmarks and bookmarklets, across all your browsers, while maintaining them in only one spot. All you have to do is remember the shortcut for the bookmarklet, so, basically, it's like a command line for your browser.

Display all Google services as buttons or as a space-saving dropdown menu next to your address bar. Reach services like Gmail, Google reader, Google maps, Google calendar, and many more in a single click from your browser.

Create shortcuts to all your favorite sites Arrange and access your bookmarks easily Organize your bookmarks with tags and categories

Easy bookmarking Save bookmarks instantly using the toolbar shortcut. Organize links in ways that are meaningful to you using #tags.

"Vimium is a Google Chrome extension which provides keyboard shortcuts for navigation and control in the spirit of the Vim editor. Watch this video to get a feel for how it works:"

Quicker way to open websites you need often A simple Firefox add-on that gives a highly convenient and clutter-free method to quickly open websites that you need often. One keyboard hotkey makes the "Launcher" panel instantly appear, followed by a single key press to jump to the site you wish to open.