
Description: Greasemonkey is a Firefox extension that allows users to install user scripts that make on-the-fly changes to web page content before or after the page is loaded in the browser. It allows customization and enhancement of web pages to suit user preferences.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Violentmonkey is a free and open-source browser extension that allows users to install userscripts. It works across all major browsers including Chrome, Firefox, Edge, and Safari. Userscripts allow customizing webpage behavior and content.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API