"Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager."

Show tabs like a tree.

A ruler plugin.

Color Balance // Hue/Saturation+ // Transparency // Flip Horizontal //Flip Vertical // Dream // Oil Painting+ // Pastel // Gaussian Blur Plus // From Clipboard // From File // Bevel Object // Feather // Inner Shadow // Object Shadow // OldFeather // Outline // Paste Alpha // Switch Alpha to Gray // Switch Gray to Alpha // Combined Adjustments // Level Horizon // Meme Maker // Remove Dust // Sharpen Landscape // Seam Carving - Horizontal // Seam Carving - Vertical // Vignette+ // Polygon / Stars // Flames // Gradients // Grid / Checkerboard // Bevel Selection // Blur Selection Edge // Feather...

I am looking for a plugin that takes an image and reduces the colors to a very small number (e.g. <10). Additionally, large areas should have the same color (i am not interested in single pixel having a different color than the pixels around.

a plugin driven, modern notification system for Gnome

Deepest Sender is a blogging client that runs inside Firefox, SeaMonkey, and XULRunner.Deepest Sender is a blogging client for Firefox. What does this mean? Well, it means that instead of having to go to the Update page on LiveJournal/WordPress/Blogger/whatever, or loading up a separate client program, all you have to do is hit Ctrl+\, or click the button in your toolbar, and you can start posting.