Best Shift Doubleclick Mozilla Addons Alternatives

Close other tabs by double-clicking the one you want to keep

Press ctrl+shift+K (or) double-click to see its meaning. This extension is ideal for those who doesn't like to switch their window to see the meaning of a word. ...

Double-click on tab to reload tab (Press SHIFT key to skip cache). Compatible with Firefox 2.* - 31.*

Go to next/previous page using 'rel' attribute.

Double-click action for Firefox -
double-click Link, Bookmark/History to open in new tab (emulate ctrl+click).

Add missing keyboard functionality to Amazon Cloud Player!

這只是很簡單的在彈出檔案儲存視窗時，可以在儲存方式的選擇項目連點滑鼠左鍵後，便如同按下確認按鈕，省去移動滑鼠的一些麻煩

Type international characters using simple keyboard shortcuts

Add missing keyboard functionality to Grooveshark!

Go up directory structure by click and key.

Proxy Tool - Powerful, yet User-friendly proxy tool to manage your proxies and anonymity needs, including: 46M+ user agents (world's largest), 10 different spoofed HTTP referrers, auto-proxy rotation, plus many more. Developed by http://ProxyList.co

View current CLGaming.net streams using this widget.

Removes all the junk from New Google Reader and just gives you the search and collapsable subscriptions + favicons. By DemianGod

Also you can install the Script for GreaseMonkey.
Download from: http://userscripts.org/scripts/show/30242

Define your own shortcuts to move the tabs into firefox.
You can move the tabs along the tab bar and at both ends.

Handy and quick access to your bookmarks using your keyboard