Open-source alternatives to GM Script

This project is a collection of reusable React hooks designed to wrap browser APIs, manage state persistence, and handle DOM observation. It provides a consistent interface for integrating native browser capabilities directly into the React component lifecycle. The library includes specialized toolkits for monitoring the browser environment, such as window resizing, network connectivity, and viewport visibility. It also provides mechanisms for managing execution timing through debouncing, throttling, and the control of timeouts and intervals. Additional capabilities cover state management wi

BewlyBewly is a browser extension that customizes the Bilibili homepage, modifying its layout and appearance to deliver a personalized browsing experience without altering the core functionality of the site. It functions as a frontend customization utility, injecting custom CSS and scripts directly into the page context to override default styles and dynamically reapply changes as content loads. The extension is built as a Manifest V3 Chrome extension, using a content script injection system and a DOM mutation observer to ensure customizations persist even as the page updates. It includes a u

happy-dom is a JavaScript-based headless browser simulation and virtual DOM engine. It implements the Document Object Model and Web APIs to execute frontend code and run tests within non-browser environments such as Node.js. The project provides a programmatic interface for creating and testing custom elements and shadow DOM structures. It supports stateful page instance management to simulate multiple concurrent browsing sessions and includes a programmable clock to synchronize asynchronous operations. The system covers a broad range of browser simulation capabilities, including DOM manipul

jsproxy is a web traffic proxy designed to route requests through a ServiceWorker to bypass network restrictions while minimizing server-side processing overhead. It focuses on browser API virtualization, rewriting URL-related functions and properties so that proxied pages behave as if they are running on their original domains. The project utilizes a decoupled architecture that separates the static user interface from the data forwarding backend, allowing for deployment across multiple providers. It includes weight-based load balancing to distribute traffic across multiple proxy nodes and im

CSDNGreener is a set of custom tools and rules designed as a browser extension or Tampermonkey user script to filter promotional content and clean web layouts. It functions as a content filter specifically for the CSDN platform, removing advertisements and floating windows to improve page readability. The project focuses on interface optimization for CSDN, modifying the layout and user interface to improve browsing speed and usability. It achieves this by removing promotional pop-ups and distracting visual elements to create a cleaner reading environment. These capabilities are implemented t

lazysizes is a JavaScript lazy loading library and DOM visibility observer that defers the loading of images and iframes until they enter the browser viewport. It functions as a responsive image optimizer and SEO friendly asset loader designed to reduce initial page load times while maintaining search engine visibility. The project calculates optimal image sizes and handles srcset and picture elements to deliver the most appropriate asset based on device resolution and layout. It includes a mechanism for low-quality image placeholders and applies CSS classes during the loading process to trig

Custom scrollbars vanilla javascript library with native scroll, done simple, lightweight, easy to use and cross-browser.

Reddit Enhancement Suite is a browser extension that injects JavaScript and CSS directly into the Reddit web interface to customize its layout, styling, and behavior. It operates entirely on the client side, storing user preferences locally and manipulating the page's DOM to rearrange elements, apply visual overrides, and observe mutations so that modifications persist even as new content loads dynamically. The extension provides keyboard-driven navigation for browsing posts and comments without a mouse, along with user-defined filtering that can hide or highlight comments and posts based on

This project is a collection of community-developed plugins and a modular framework designed to extend the functionality of the Jupyter notebook environment. It serves as a customization tool that modifies the browser-based workspace through a system of injected scripts, stylesheets, and interactive components. The framework manages the lifecycle and registration of independent interface components using metadata-driven configuration. This allows users to enable or disable specific tools via a configuration menu to tailor the workspace without modifying the core application source code. The

prefixfree is a runtime CSS processor and polyfill library designed to ensure cross-browser visual consistency. It functions as a client-side script that automatically detects browser requirements and injects necessary vendor prefixes into CSS properties and values at runtime. The project utilizes a system that intercepts stylesheets and modifies style rules in browser memory. It includes a DOM mutation style monitor that observes the document tree for new elements to apply prefixing logic to dynamic content and attributes. The library provides polyfilling for modern CSS standards in legacy

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

Isotope is a JavaScript grid layout library used to create filterable and sortable grids with automatic element positioning in the browser. It functions as a layout engine that calculates absolute coordinates for elements to maintain a dense grid regardless of individual item dimensions. The library features a masonry layout engine that arranges items of varying heights into a compact grid to eliminate vertical gaps. It includes a coordinate-based layout animator for smooth transitions during layout shifts and a CSS selector filtering tool to show or hide elements without reloading the page.

Notion Enhancer is a customization framework and desktop application modifier designed to inject JavaScript and CSS into Notion. It functions as a plugin system and theme engine that modifies the interface and core application behavior. The project enables the overriding of internal software logic and the injection of custom scripts to change default behaviors. It includes a theme engine for overriding CSS variables to apply custom visual schemes and provides support for right-to-left text direction. The framework covers a range of capabilities including workflow automation through user inpu

rrweb is a DOM session recording library and serialization framework used to record and replay web sessions. It converts the state of a web page into a serializable JSON data structure and tracks mutations to reconstruct user interactions within a replay engine. The system distinguishes itself by using a sandboxed iframe for reconstruction to isolate replayed content, preventing script execution and form submissions. It ensures visual consistency through CSS inline-style flattening and provides sensitive data masking to prevent private information from being captured. The project covers a br

Zhiliao is an Xposed Android app module designed to modify the behavior and interface of the Zhihu mobile application. It functions as a runtime modification tool that uses hook injection to alter application elements and logic. The project provides system-level ad blocking to remove promotional content from feeds, search results, comments, and startup screens. It includes a rule-based content filtering engine that uses keywords and regular expressions to hide specific post types, such as videos and articles, or social features. The module offers interface customization and navigation enhanc

Refined GitHub is a browser extension that modifies the GitHub web interface to add features and remove annoyances. It functions as a user interface enhancement tool that uses custom CSS and JavaScript to rearrange layouts and inject new interactive elements into GitHub pages. The project serves as a workflow automation tool and repository utility, providing capabilities to automate pull request tasks such as branch cleanup and commit defaults. It acts as a code review assistant by identifying conflicting pull requests and improving navigation for code references. The extension covers severa

Spicetify-cli is a command-line utility framework designed to inject stylesheets, scripts, and extensions into a local desktop application installation. It specifically serves as a customization tool for the Spotify desktop client, allowing for modifications to the user interface and the addition of new functional capabilities. The tool operates as a cross-platform extension framework compatible with Windows, macOS, and Linux. It functions by injecting custom CSS to modify interface colors and visual appearance, while utilizing script injection to add new tools and features to the application

RemoveAdblockThing is a browser extension that removes YouTube's adblock detection popup and skips video ads without triggering the platform's anti-adblock systems. It is designed to maintain an uninterrupted viewing experience by eliminating the intrusive "Ad blocker are not allowed on YouTube" message and automatically bypassing ad detection mechanisms. The extension works by injecting a content script at document_start to intercept and modify page behavior before YouTube's ad detection scripts run. It uses a DOM MutationObserver to monitor the YouTube DOM for ad-related elements and detect

This project is a web content filtering tool designed to remove low-quality or spammy Chinese language websites from Google search results. It functions by identifying and hiding results from unreliable domains to improve the relevance of discovered content. The tool employs pattern-matching domain filtering and curated blocklists to identify unwanted websites. It uses browser extension content scripting to scan the search engine results page and apply CSS-based element hiding to the parent containers of blocked sites.

Responsively-lazy is a library designed to optimize web performance by deferring the loading of off-screen assets until they are required by the user. It functions as a utility for reducing initial page payloads by delaying the rendering of images, background images, and HTML content until elements enter the browser viewport. The library distinguishes itself through its automated handling of dynamic content. By utilizing a mutation observer, it monitors the document tree for new elements added after the initial page load and applies lazy loading behaviors to them without requiring manual re-i

This project is a browser extension that transforms the standard GitHub activity chart into a three-dimensional isometric pixel art display. It functions as an isometric data visualization tool that represents contribution volume through varying heights of pixel blocks. The tool enables users to toggle activity graph displays between standard two-dimensional views and isometric perspectives. It modifies the appearance of GitHub profile pages by extracting contribution metrics and rendering them as 3D visual assets. The implementation covers client-side data extraction, DOM manipulation, and

Better-scroll is a JavaScript scroll library and touch interaction engine designed to create high-performance scrollable areas in web browsers. It functions as a modular UI component framework that provides the foundation for building complex scrollable elements. The library is distinguished by a plugin-based architecture that allows the injection of custom methods and event hooks. This system enables the creation of specialized interface components such as carousel sliders, scrollable picker inputs, and draggable element systems. The project covers a wide range of mobile web interaction pat

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Pagefind is a static site search engine that indexes HTML files to provide a browser-based search experience without the need for a backend server or API. It consists of a multilingual search indexer and a set of prebuilt, customizable user interface components for rendering search inputs and result lists. The system is designed for global content, utilizing a multilingual search indexer that detects page languages and creates independent index bundles to provide language-specific stemming and results. It further optimizes performance by using a compressed index and offloading query execution

Pyppeteer is a Python library for controlling Chromium-based browsers using the Chrome DevTools Protocol. It functions as a headless browser automation tool, allowing for the programmatic navigation of web pages and the extraction of data from dynamic websites. The project provides low-level browser control through direct communication with the Chrome DevTools Protocol, enabling the interception and modification of network traffic. It differentiates itself by offering specialized performance profiling capabilities, including the measurement of JavaScript and CSS code coverage and the capture

KeepChatGPT is a browser extension designed to enhance the ChatGPT web experience by acting as a session manager, UI optimizer, and privacy guard. It focuses on maintaining active connections to prevent session timeouts and improving the overall interface for better readability and organization. The project distinguishes itself through privacy and security features that block tracking telemetry and use regular expressions to mask sensitive data before it is sent. It also includes tools to mitigate conversation auditing and bypass bot verification challenges to reduce the risk of account restr

Picturefill is a responsive image polyfill that adds support for the picture element, srcset, and sizes attributes in browsers that lack native implementation. It emulates the picture element with source media queries and format fallbacks, providing responsive image selection based on viewport size and device pixel ratio. The polyfill reevaluates responsive image sources after dynamic DOM changes to keep displayed images correct, and delivers alternative image formats like WebP with automatic fallback to standard formats in unsupported browsers. It also conserves bandwidth by selecting smalle