Install and Use Greasemonkey

Greasemonkey is only available for Firefox. To download it, visit the Greasemonkey download page on the Mozilla add-ons website. After Firefox restarts, a new button in the form of a smiling monkey appears in the browser’s address bar. Select the monkey toggle switch to enable and disable the Greasemonkey extension. Select the down arrow accompanying the toggle to modify the Greasemonkey settings and open the Firefox User Scripts management interface.

Install and Use Tampermonkey

Tampermonkey is available for a range of web browsers. Similar to Greasemonkey, you manage Tampermonkey using a toggle switch on the address bar. This toggle switch turns its functionality off and on, checks for updates, creates your user script, and opens a dashboard where you manage the Tampermonkey settings and the installed scripts. To install Tampermonkey on Chrome, Microsoft Edge, Firefox, Safari, and Opera Next, visit the extension’s official website and follow the instructions specific to your browser.

The Top User Scripts

Here are some of the best scripts, listed in alphabetical order.  It works best with Chrome or Firefox. This script works with all browsers, but the direct-download feature only works with Chrome.

Greasy Fork: Greasy Fork is a terrific source for user scripts. It offers a rapidly growing compendium of over 10,000 scripts, a well-maintained and easy-to-use interface, and an active forum. The Greasy Fork Bull**** Filter script makes searching the site effortless. It hides scripts for games, social networks, and those with non-English characters in the Greasy Fork description. OpenUserJS: OpenUserJS offers a wide range of scripts. It provides a user-friendly repository with a continually expanding selection. Userscripts.org (mirror): At one time, Userscripts.org was the only place to find the best scripts. It went offline and is now available as a mirrored site on a different domain. You’ll find thousands of scripts on this mirror site, and many of these are not safe. Use discretion when downloading from the Userscripts.org mirror.