Blocks annoying video ads on YouTube, Facebook ads, banners and much more.
Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
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.
Control what gets sent as the HTTP Referer on a per-site basis.
Allows URI texts written in webpages to be loaded by double clicks.
Lets you load pages in IE with a single right-click, or mark certain sites to *always* load in IE.
More Advanced (hidden) configures
GMarks helps you sync & manage your bookmarks with Google Bookmarks...
Indicates status of IME by changing background color of textbox.
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