Open Source Browser Extensions
Browser extensions add features to web browsers or adapt how websites behave, helping people improve privacy, customize interfaces, automate routine tasks, and access tools without leaving a page. They typically run with permissions to read or change browsing data, so their design and security practices matter as much as their features. Many use web technologies and browser extension APIs, with compatibility varying across browsers and versions.
Open source options include content blockers, password and privacy tools, accessibility aids, research utilities, productivity features, and integrations with online services. When choosing one, review its license, permission requests, maintenance activity, browser support, and data handling practices. Check whether it depends on external services or specific software, and whether its features fit your workflow. These tools can be useful for everyday users, developers, researchers, and organizations seeking control over their browsing experience.
14 repositories · updated July 2, 2026
OpenWebAgent: An Open Toolkit for LLM- and LMM-based Web Agents
OpenWebAgent is an open toolkit designed to empower model-based web agents, streamlining human-computer interactions by automating tasks on webpages. It offers a convenient framework for developing LLM- and LMM-based web agents, providing both plugin and server source code for easy integration and customization. This project was featured as an ACL'24 Demo, showcasing its innovative approach to web automation.
Scramble: An Open-Source AI Writing Assistant for Your Browser
Scramble is an open-source Chrome extension that leverages AI to enhance your writing directly in the browser. It offers a customizable alternative to Grammarly, allowing users to configure LLM providers, models, and endpoints. With support for various large language models and custom prompts, Scramble provides flexible text enhancement options.
ClearURLs Addon: Automatically Remove Tracking Elements from URLs
ClearURLs Addon is a powerful browser extension that automatically removes tracking elements from URLs, significantly enhancing your online privacy. Optimized for Firefox and Chrome-based browsers, this WebExtension cleans up links in real-time, preventing websites from monitoring your activity and ensuring a more secure browsing experience.
Read Frog: Open Source AI-Powered Immersive Translate Extension
Read Frog is an open-source, AI-powered browser extension designed for immersive language learning. It offers features like bilingual translation, context-aware AI, text-to-speech, and deep article analysis to help users master languages effortlessly. Available for Chrome, Edge, and Firefox, it supports over 20 AI providers and various translation modes.
SponsorBlock: Crowdsourced Extension to Skip YouTube Video Sponsors
SponsorBlock is an open-source, crowdsourced browser extension designed to automatically skip sponsor segments in YouTube videos. Users contribute by submitting timestamps for sponsored content, which then allows the extension to enhance the viewing experience for everyone. It also supports skipping other categories like intros, outros, and reminders to subscribe.
Page Assist: Integrate Local AI Models Directly into Your Web Browser
Page Assist is an open-source browser extension that integrates your local AI models directly into your web browsing experience. It provides a sidebar and a dedicated web UI, allowing users to interact with their AI model, including chatting with the content of any webpage. This tool supports various Chromium-based browsers and Firefox, emphasizing privacy by keeping all data local.
Mitaka: A Browser Extension for Streamlined OSINT Search
Mitaka is a powerful browser extension designed to simplify Open Source Intelligence (OSINT) searches. It automates the selection of Indicators of Compromise (IoCs) and supports over 65 services for comprehensive threat intelligence gathering. This tool is essential for security professionals and researchers looking to enhance their investigative workflows directly from their browser.
web-archive: A Free Web Archiving and Sharing Service on Cloudflare
web-archive is an open-source project offering a free web archiving and sharing service built entirely on Cloudflare's serverless ecosystem, including Workers, D1, and R2. It comprises a browser plugin for saving pages, a server to manage uploads, and a web client for viewing archived content. This self-hosted solution provides robust features for preserving and accessing web pages.
AliasVault: Privacy-First Password and Email Alias Manager
AliasVault is an open-source, privacy-focused password and email alias manager designed to enhance online security and privacy. It offers end-to-end encryption, a built-in email server for aliases, and supports self-hosting for complete control over your data. This tool helps users create unique identities and strong passwords for every online service.
Refined GitHub: Enhance Your GitHub Experience with Powerful Features
Refined GitHub is a popular browser extension designed to significantly simplify and enhance the GitHub interface. It introduces a wide array of useful features, addressing common annoyances and streamlining workflows for developers. This extension aims to make your daily interactions with GitHub more efficient and enjoyable.
Bonjourr: A Minimalist and Customizable Startpage for Your Browser
Bonjourr is a minimalist and lightweight startpage designed for your internet browser, drawing inspiration from the clean aesthetics of iOS. It offers extensive customization options, dynamic backgrounds, and essential features like a search bar, clock, and weather. Available as a browser extension for Chrome, Firefox, Edge, and Safari, it provides a clean and personalized browsing experience.
KeepChatGPT: Enhance Your ChatGPT Experience with Security and Efficiency Features
KeepChatGPT is a powerful user script designed to significantly enhance your ChatGPT experience, offering improved data security and efficiency. This plugin provides innovative features like automatic refresh, active session maintenance, and conversation cloning. It aims to make your AI interactions safer, smoother, and more efficient by resolving common errors and adding valuable functionalities.