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Extension Manager Extended
Requires Restart
Use the Addon Manager to view the id, date installed, compatible application versions, and the folder of an extension or theme. Check http://extended.spanglerco.com for more information and http://firefox.spanglerco.com for more extensions...
OverbiteFF
Requires Restart
Add legacy protocol support back to Firefox and SeaMonkey with OverbiteFF, which restores support for Gopher servers, plus CSO/ph searches, finger, whois and more! Cross-platform JavaScript runs anywhere Firefox does.
Restart App Button
Restart the current application, as you might need to do after installing a new extension or theme.
Clip to OneNote
Requires Restart
Clip to OneNote is a free add-on which helps you to send text, pictures and other data to Microsoft Office OneNote with a single click.
AastraClickToCall
Requires Restart
Converts telephone numbers into clickable links for use with Aastra IP Phones
Version in Add-on bar
Requires Restart
Show the Firefox/Thunderbird version number in the addon bar (formerly called status bar).
Orkut Toolbar
Requires Restart
Orkut Toolbar helps you to format the text of your posts in the Orkut forums, easily access all common functions of orkut, create and manage custom signatures and insert and view images and flash movies in orkut posts and scraps.
Mozilla Labs - Jetpack Prototype
Requires Restart
Jetpack Prototype is an experiment in making it easy to build Firefox add-ons using common web technologies.
About:about Button
A button that lists all the about pages that exist. Some of these pages are also provided as separate buttons.
Add-on Preferences Button
Displays a menu that allows you to open the option/preference window for any add-on that has one.
Print Preview Button and Keyboard Shortcut
Requires Restart
Adds a "Print Preview" button to the customize toolbar in Firefox.
Binds the Ctrl+Alt-Shift+P keyboard shortcut to Print Preview.
Key config
Requires Restart
This add-on provides configurable keyboard shortcuts for several actions and a dialog to customize them.
All shortcuts can be redefined in Tools -> Key settings
To create your own collections, you must have a Mozilla Add-ons account.