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Greasemonkey allows users to install scripts to Firefox to change the behaviour of web pages, or to add additional tools and tweaks to web applications, such as Facebook. From here, we want to install the add-on.
3. Click the Add to Firefox button. You may be prompted a few times to install the addon to the browser.
4. You should then restart Firefox when it prompts to you to do so. In doing this, it will install Greasemonkey and will allow you to install additional scripts.