What is Plasmo?
Building powerful tools on top of the web shouldn't be a complex undertaking. Plasmo is a dedicated platform designed to streamline the entire lifecycle of browser extension development, from initial coding to testing and final deployment. It helps you focus on creating value for your users by simplifying the underlying complexities, enabling you to build, test, and deploy your extensions faster and more reliably.
Key Features
⚛️ Integrate Modern Frameworks: Use your preferred UI libraries like React, Svelte, and Vue seamlessly. Plasmo automatically handles mounting your existing components into your extension environment, letting you leverage familiar development patterns.
🛡️ Prevent Style Conflicts: Automatically create a Shadow DOM for your content scripts. This isolates your extension's styles from the host page and vice versa, ensuring a clean and predictable visual experience without unintended side effects.
⚡ Iterate with Speed: Benefit from a dedicated runtime optimized for extensions. Experience instant feedback with live-reloading as you make code changes, and enjoy React HMR (Hot Module Replacement) to see component updates without a full page reload, significantly accelerating your development loop.
🌍 Develop Cross-Browser: Maintain a single codebase that works across all major browsers. Utilize features like target-specific entries (e.g.,
popup.firefox.tsx) and built-in environment variables to easily manage browser-specific logic and configurations without code duplication.🚀 Simplify Testing & Deployment: Deploy test versions of your extension to testers in seconds using Plasmo Itero, bypassing store review processes. Integrate with GitHub to automate beta deployments with every push. Manage production web store credentials and publish updates to multiple browsers with a simplified interface.
Use Cases
Rapidly Prototype and Build: Imagine you're building a complex browser-based productivity tool using React. Instead of wrestling with Webpack configurations, content script injection, and background service workers from scratch, Plasmo allows you to drop in your React components, manage state, and handle communication between extension parts with minimal boilerplate. You can see your changes reflected instantly as you code, allowing you to build out features much faster.
Ensure Cross-Browser Compatibility: Your extension needs to work flawlessly on Chrome, Firefox, Edge, and potentially others. With Plasmo's one-codebase approach and target-specific overrides, you can handle minor browser API differences or apply specific styles for different environments within the same project structure. This saves significant time compared to maintaining separate projects or complex conditional logic scattered throughout your code.
Streamline Beta Testing and Release: Before launching a new feature to everyone, you want a group of beta testers to try it out. Using Plasmo Itero, you can push a new version directly from your development environment or GitHub repo, and testers can install it with a single link, bypassing the typical store review wait times. Once validated, Plasmo helps you manage the credentials and process for publishing that tested version to all target web stores with less friction.
Conclusion
Plasmo provides a robust and opinionated framework that abstracts away much of the complexity inherent in browser extension development. By offering first-class support for modern web technologies, automating build processes, simplifying cross-browser compatibility, and streamlining testing and deployment, Plasmo empowers developers to build high-quality, performant extensions more efficiently and reliably. It's about removing the tedious setup and maintenance so you can concentrate on creating valuable experiences for your users.
More information on Plasmo
Launched
2021-03
Pricing Model
Freemium
Starting Price
$30 per month
Global Rank
530601
Follow
Month Visit
62.4K
Tech used
Google Analytics,Google Tag Manager,Amazon AWS CloudFront,Gzip,HTTP/3,Progressive Web App,Amazon AWS S3
Top 5 Countries
15.89%
11.87%
9.78%
5.23%
5.04%
Brazil
Vietnam
United States
Germany
India
Traffic Sources
3.71%
0.82%
0.14%
10.1%
47.51%
37.62%
social
paidReferrals
mail
referrals
search
direct
Source: Similarweb (Sep 24, 2025)
Plasmo was manually vetted by our editorial team and was first featured on 2024-09-11.
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