Userscripts.org

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

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

Makes thumbnails cycle though the 3 previews. Additional feature to view all thumbnails on mouse hover, and move off to hide them.

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

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

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

Automatically pauses the video when you switch to a different tab or window, and automatically plays when you come back to it

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

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

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

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

Auto-load more comments. Click "Auto Load Comments" and more comments autoloads. Click "Stop" to stop loading. Toggle comments by clicking the Toggle Comments button.

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

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.

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

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

Allows you to hide elements by double click

Dim the Lights and watch your video in peace. Auto Dim lights setting (statusbar icon menu config). Works with Firefox, Chrome and Opera! Currently testing, Working well. Try it.

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

Allows you to toggle the Google Search Sidebar

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

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.

Toggle sidebar on/off on mozwiki and devmo

Add multimedia keyboard support for Grooveshark (play/pause)

Allows you to toggle between showing member items and not

Adds MBTA map functionality to Google Maps.

Toggles Un/Read Mail at Indamail.hu