Identifies redirected URLs and allows you to visit the target link directly, avoiding unwanted redirects...
A Statusbar with speed, percentage, time and loaded size (similar to Opera's one)
Would you like to know which websites are safe and which website you can trust?
The Webutation add-on shows you the reputation of a site with a simple green/yellow/red icon and scans websites against virus and bad userfeedback. Works similar to WOT.
Integrate 'My JDownloader' into your Firefox browser
A productive way to organize, read and share the content of your favorite feeds, blogs and news sites. Feedly offers a seamless transition from Google Reader.
Hide title bar if window is maximized.
This extension created only for GNOME 3. It can create problems with another DE (KDE, XFCE, etc). However, you can use HTitle at your own risk (need enable "legacy" mode on settings page).
Shows a full size image when you hover over thumbnails on popular websites like Facebook, Twitter or Amazon.
Open your Microsoft Visio files for free
Good old Wikipedia gets a great new look
Signatures for Gmail, Google Mail, Yahoo Mail
Add-on for Firefox and Thunderbird. Integrates Firefox's notifications with the OS's native notification system. It supports most Linux desktops and Windows 8.