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Tampermonkey is a userscript manager used for browser behavior modification and web page automation. It allows for the installation and management of custom scripts that inject JavaScript into web pages to change their appearance or functionality.
The main features of tampermonkey/tampermonkey are: Userscript Managers, Web Task Automations, Page Content Modifications, Browser Extension Script Managers, Script Injections, URL-Matched Injections, Cross-Platform Collection Syncing, Sandboxed Scripting.
Open-source alternatives to tampermonkey/tampermonkey include: scriptscat/scriptcat — Scriptcat is a user script manager and browser extension designed to install, execute, and manage custom JavaScript… violentmonkey/violentmonkey — Violentmonkey is a userscript manager extension and JavaScript injection framework. It allows users to install and… quoid/userscripts — Userscripts is a Safari browser extension that installs and runs custom JavaScript and CSS on websites through Apple's… mdn/webextensions-examples — This project is a reference library and collection of practical code samples for building browser extensions using… greasemonkey/greasemonkey — Greasemonkey is a Firefox extension that functions as a JavaScript userscript engine and manager, executing custom… requestly/requestly.
Scriptcat is a user script manager and browser extension designed to install, execute, and manage custom JavaScript scripts to modify website behavior and extend browser functionality. It features a JavaScript sandbox environment that provides specialized APIs for storage, cookies, and system notifications, alongside a cloud-synced script repository to keep subscriptions and configurations consistent across multiple devices. The project includes an in-browser script editor for writing, testing, and debugging code directly within the browser. It also incorporates a cross-domain request engine
Violentmonkey is a userscript manager extension and JavaScript injection framework. It allows users to install and manage custom scripts and CSS to modify the behavior and appearance of websites based on metadata-driven trigger conditions. The project functions as a cloud-synced script manager, backing up and synchronizing scripts across different devices using external cloud storage services. It also serves as a cross-origin request bridge, providing a communication layer that enables scripts to bypass the same-origin policy to fetch data. The tool covers a broad range of browser automation
Userscripts is a Safari browser extension that installs and runs custom JavaScript and CSS on websites through Apple's content script injection system. It provides a privileged execution context that allows userscripts to perform cross-origin HTTP requests and access clipboard functionality beyond standard browser sandbox restrictions. The extension uses metadata tags like @match, @run-at, and @weight to control precisely when and where scripts execute on web pages. It includes a built-in code editor with syntax highlighting and linting for modifying scripts directly, and supports automatic s
This project is a reference library and collection of practical code samples for building browser extensions using WebExtensions APIs. It provides implementation guides and functional examples for core extension components, including content scripts, background processes, and browser action popups. The repository focuses on demonstrating specific implementation patterns for browser UI customization and web page manipulation. It includes samples for creating sidebars, context menus, and options pages, as well as techniques for injecting scripts and styles to alter DOM elements and page appeara