Userscripts.org

Enables inline image expansion for all images. Should play nicely with userscripts that modify the DOM after it has been loaded.

Tons of assorted developer functions ranging from button removal to element fade-ins to advanced xpath grabbers.

Adds a button to Literature to toggle the viewing area width to fill the page.

Provides a link on the page or userscript command to enable/disable this script easily

Modify Facebook: widen pages, remove ads/spam on homepage, move pokes and events to top of homepage. Options are set to toggle on/off.

Gives you the ability to clean the page of everything but the game

Fixed-font message bodies toggle for GMail (new UI/API version)

A simple script that uses a key press "S" to toggle the GMail searchbar. Inspired by this great script... http://userscripts.org/scripts/show/50486

Use this GreaseMonkey script to reclaim the hefty area that the GMail's searchbar and Logo area take up.

Adds reply and reply-to-author buttons to Google+ comments

Allows you to toggle the Google Search Sidebar

Add multimedia keyboard support for Grooveshark (play/pause)

Allows you to hide elements by double click

Adds buttons to top-left of FB page for hiding/showing the sidebar/chat/ads from view. Script compatible with Greasemonkey/FireFox as well as Tampermonkey/Chrome. No reload of page needed to hide/show.

Toggles Un/Read Mail at Indamail.hu

Adds MBTA map functionality to Google Maps.

Lets you hide add-ons you don't want to see

Toggle sidebar on/off on mozwiki and devmo

Cleans up image and video galleries, leaves only thumbs. They can be individually toggled for download. - Complete application!

Allows you to toggle between showing member items and not

Show/hide the header, footer and sidebar tabs on iGoogle to save space! Perfect for small screens or netbooks!

Toggle toy or game items on Tanga (tanga.com)

Changes the background color of a page and also the color of text & links to make pages easier to read. Use F2 key to toggle the colors on and off.

Allows Toggling of Youtube Comments via button. It has options now! Chrome, Firefox should both work.

Add toggles for showing/hiding @replies and #hashtags on twitter.com and brizzly.com

Change page's color scheme to optimize for watching videos. Can toggle on/off with a hotkey

Creates a set of links for all of your Yahoo Fantasy leagues. You'll need to customize it with your league names and IDs. (Links replace the "Make Y! your homepage" link at the top...but seriously, who cares about that?)

adds a big button on the left of the page to quickly hide and pause the video in 1-click.