Browser User Script

Browser User JavaScript Addon / Extension

Chrome/Chromium
Tampermonkey Chrome Extension

Firefox
Greasemonkey Firefox Addon
scriptish Firefox Addon

Opera
violentmonkey Opera Addons

Safari
Ninjakit Safari Extension

Script:
AdsFight! Script
http://userscripts.org/scripts/source/118033.user.js
ads Skiper Script
Redirection Helper

Others:

Quix App
Web / Bookmarklet