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Dev tools · April 13, 2026

[epos] Web Extension Engine

A browser extension for building browser extensions

What it does

Epos is an opinionated engine for building Chromium browser extensions with React. While frameworks like WXT and Plasmo prioritize flexibility, Epos focuses on a zero-config experience with powerful features that work out of the box. At a high level, Epos gives you: - A cross-context messaging system - Shared state with persistence and sync - Storage for files and data - Extension APIs available in any context - Automatic script injection + Shadow DOM - A simpler setup through epos.json

Does the same job

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  • Plasmo2023 · ▲243

    The browser extension platform

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    Hello HN! I'm the creator and solo developer of Extension.js, a development tool for browser extensions with built-in support for TypeScript, WebAssembly, React, and modern JavaScript. Developers use it to spend less time configuring the compilation config or learning new frameworks and more time actually writing code. Most projects similar to Extension.js rely on some sort of abstraction or configuration to get started, making the initial development process slow given the extra learning curve and setup guidelines. By using Extension.js, adding the package to your npm scripts is all it…

  • PA
    Plasmo – a framework for building modern Chrome extensions2022 · github.com · ▲132

    Hey HN, we're excited to have people try out our framework! When we built out a Chrome extension earlier this year, we noticed that the config was too imperative. You had to constantly tell Chrome via the manifest.json file where your files were, what your permissions should be, etc. So we thought it might be interesting to build a more declarative framework. When we built a proof of concept, we enjoyed working with it and decided to invest more time into making it usable and adding more features. We're still pretty early in building it out, and there's a bunch more we want to add, but this…

  • extensions.af2017 · ▲567

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    Build cross browser extensions for Chrome, Firefox & Opera

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