Open the script page you want to install, for example Endless Google.For example, let's search for a Google userscript Enter the keywords into the Search Userscripts text input: can be the target website name, the desired feature, etc.The following example illustrates how to search for a userscript on OpenUserJS and install it on Google Chrome with Tampermonkey: The majority of userscripts are hosted either on or. asynchronous API and doesn't have a polyfill to support the older API (very rarely). You will have to install it only if a userscript you want to add is written specifically using the new GM. I discourage using it at the moment because the majority of userscripts are written using the older API and the other userscript managers don't support the new asynchronous API. Following Firefox 57, and starting from the version Greasemonkey 4, the extension changed its API to be compatible with the Browser Extension API, and no longer support scripts written using the older GM_ synchronous API (more explanations can be found in this blog post). Greasemonkey is the original userscript manager. The following page lists the download links for the different supported browsers: Greasemonkey It's available in Firefox, Chrome, Opera and Maxthon. Violentmonkey is the main alternative to Tampermonkey, and is completely open source. More detailed instructions to install Tampermonkey and a comprehensive features overview is presented in the following links: Google Chrome, Opera, Microsoft Edge, Safari.

Here are the direct pages where you can install the Tampermonkey extension: It's also available in all the major navigators.

With more than 10 million users, Tampermonkey is the leading userscript manager. Violentmonkey is currently the best supported userscript manager for Firefox. From my experience, Tampermonkey is best suited for Chromium-based browsers such as Google Chrome and Opera.

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