The scripts featured here each have a significant user base and have proven to be relatively safe. User scripts are not vetted in the same fashion that most browser extensions are, so you should use them at your own risk.
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. From here you toggle its functionality off and on, check for updates, create your own user script and open a dashboard where you can manage Tampermonkey's settings as well as all the scripts that have been installed. What is similar to Greasemonkey, however, is that the Tampermonkey add-on is also managed through the menu associated with its address bar button. Unlike Greasemonkey, which only runs on Firefox, Tampermonkey is available for a wide range of web browsers. Selecting the down arrow accompanying the button lets you modify Greasemonkey's settings and open Firefox's User Scripts management interface. Clicking the smiling monkey button toggles the Greasemonkey extension. After Firefox restarts, a new button in the form of a smiling monkey appears in your browser's address bar. To get started, visit the Greasemonkey download pagefound on Mozilla's add-ons website. Greasemonkey is only available for Firefox.
Install either Greasemonkey or Tampermonkey, depending on your browser, to serve as your user-script manager - then search for extensions, or check out the ones we've highlighted below. Written by private developers in the JavaScript programming language, the functionality of these scripts range from downloading entire Facebook and Instagram albums in one click to completely revamping Pandora's look and feel.