Usability is a term used to denote the ease with which people can employ a particular tool or other human-made object in order to achieve a particular goal. Usability can also refer to the methods of measuring usability and the study of the principles behind an object's perceived efficiency or elegance.
In human-computer interaction and computer science, usability usually refers to the elegance and clarity with which the user interface of a computer program or a web site is designed. The term is also used often in the context of products like consumer electronics, or in the areas of communication, and knowledge transfer objects (such as a cookbook, a document or online help). It can also refer to the efficient design of a mechanical objects such as a door handle or a hammer.

AutoCopy - Allows you to select text on any web page and have it automaticaly copied to the clipboard.
Autoscroll - An addon for Mozilla and Phoenix that emulates the autoscrolling functionality of Internet Explorer.
Copy URL+ - Enables you to copy to the clipboard the current document's address along with additional information such as the document's title, the current selection or both.
downloadstatusbar - An extension that allows you to keep track of ongoing and completed downloads in a statusbar.
DownloadWith - An extension to download files with external programs.
easyGestures Pie Menus - easyGestures is a extension for Mozilla Firefox that replaces context menus with easy-to-navigate context menus. Includes a config diaglouge and uninstaller.
Meta Description: [ Perform mouse gestures with a customizable pie menu for Mozilla Firefox browser. ]
firstfield - Adds a new hotkey (Ctrl+;) which focuses on the first text field on the page.
ImageShowHide - Allows you to toggle images on webpages.
leech - Downloads all the files (images, video clips, zip archives, etc.) from a single page.
LookAhead - Created to provide for efficient usage of time while a user performs Google searches by loading each result in its own tab.
MozBraille - An extension to transform Mozilla or Firefox to a stand alone accessible Internet browser designed for blind or partially sighted users.
MozFBRH - Provides Middle-Click on most toolbar buttons.
mozless - Keyboard friendly navigation for Mozilla/Firefox.
MultiZilla - MultiZilla is the first tabbed browser UI for Mozilla and has enhanced features over the default implementation.
One Click Dynamic Sidebar - A dynamic sidebar for Mozilla apps that include many programs in one sidebar.
Optimoz - The Optimoz plans to perform widespread beta testing of gestures in Mozilla and to perform the development of robust pie menu support for Mozilla.
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