Currency exchange rates in the status bar (data from Yahoo!Finance or Google on option).
Display currency graphs.
Make your browsing experience faster by avoiding wait time on DNS lookups
Bring back your personal and powerful Firefox Button!
Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.
OpenDownload² extends the "Save" dialog by a "Run" button to open the file directly.
Defragments your Firefox "Places" database (history/bookmarks)
This greatly reduces the lag while typing in the address bar and the start-up time.
This extension features configurable automatic cleaning, periodic reminder, and internationalization.
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.
Send news articles, blogs posts and other web content to read them anytime, everywhere on Kindle devices or reading apps.
RAMBack will cause Firefox to issue an internal notification to free up memory that is otherwise held for performance purposes. Additional items will be hooked into this notification in the future.
JSON编辑器,It's a browser and editor for JSON document.You can get a beautiful view.
Firebug extension to view which CSS rules are actually used.