The Graphing Calculator Toolbar brings a very unique feature to the browser. You can enter up to 5 equations into this toolbar, then view the graphs using Firefox native SVG support. The toolbar allows rescaling the x and y coordinates and redefining the domain.
Have you seen Shop Companion? It lets you access to full-resolution product images and videos on various shopping sites is easy with this add-on. It adds links to the largest/xxl/best-size version of product images on various shopping sites.
Having problem with a laggy Flash player? This extension solves issues with lag and stuttering of flash player.
Tired of unexpected pop-ups? This extension for Firefox will open all pop-ups in a new tab.
When switching between multiple tabs, often there is a situation when you forget which tab you were before switching to the other one. This small extension solves this problem by highlighting the previous tab.
My YouTube is an extension aimed at avid YouTubers. It acts as a notifier by letting you know when your favorite YouTubers have uploaded new videos.
Have you checked out Omnifocus? It is a very interesting todo list manager for Apple fans out there. The Add to Omnifocus add-on for Firefox is an unofficial add-on to add the current page to Omnifocus as a new task.
Quickly deletes pages with a default reason on MediaWiki websites with many shortcuts.
Show your password in a readable format in the password fields of the web pages.
This add-on for Firefox lets you create serial tabs with load-ahead preparations from bookmarks.