If you work with lots of websites on a daily basis and find that alternating between leaving JavaScript on and off through the settings page too taxing, you might want to check out this convenient browser extension.

Simple JavaScript Toggle is a tool for allowing you to turn on and off JavaScript on a site-by-site basis. The extension itself only takes a few seconds to download. It's straightforward and easy to use. It offers a single button on the browser's toolbar. You just need to click it to turn JavaScript off or on on a site.