Plasmo Framework

The Plasmo (opens in a new tab) Framework is a battery-packed browser extension SDK made by hackers for hackers. Build your product and stop worrying about config files and the odd peculiarities of building browser extensions.

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It's like Next.js (opens in a new tab) for browser extensions!

CLI Demo

Features

Highlighted	Features
First-class React (opens in a new tab) + Typescript (opens in a new tab) Support	Declarative Development
Content Scripts UI	Tab Pages
Live-reloading + React HMR	`.env*` files
Storage API	Messaging API
Targeting multiple browser and manifest pairs	Remote code bundling (e.g., for gtag4)
Automated deployment via BPP	Optional support for Svelte (opens in a new tab) and Vue (opens in a new tab)
And many, many more! 🚀

System Requirements

Node.js 16.14.x or later
macOS, Windows, or Linux
(Strongly Recommended) pnpm (opens in a new tab)

Getting Started

pnpm create plasmo
# OR
yarn create plasmo
# OR
npm create plasmo

Plasmo project files

This command will set up the simplest Plasmo browser extension project for you. The structure is straightforward:

File name	Description
`popup.tsx`	This file exports a default React component, which gets rendered into your popup page. This is all you need to work on your extension popup!
`assets`	Plasmo automatically generates the smaller icons and applies them in the manifest for you from the "icon.png" file
`package.json`	Your usual Node.js project descriptor, with an optional "manifest" property to customize Plasmo to your needs
`.prettierrc.cjs`	For code styling consistency
`.gitignore`	Your friendly neighborhood Git ignore file
`.github`	GitHub Actions workflows for automated deployment
`README.md`	Basic documentation
`tsconfig.json`	TypeScript configuration

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NOTE: By default, all your code lives on the root of your project. To use an src directory as the place your source code lives, please follow this guide.

Development Server

For live-reloading and HMR, you can start the development server with:

pnpm dev

The above command will watch for file changes and regenerate a bundle of your extension in build/chrome-mv3-dev, and automatically reload your extension in your browser.

Production Build

For a production build, run:

pnpm build

This will create a production version of the extension in build/chrome-mv3-prod

Loading the Extension in Chrome

We plan to automate this in the future, but for the time being, these are the steps you need to take to load your extension in Chrome.

Head over to chrome://extensions and enable Developer Mode.

Click on "Load Unpacked" and navigate to your extension's build/chrome-mv3-dev (or build/chrome-mv3-prod) directory.

To see your popup, click on the puzzle piece icon on the Chrome toolbar, and click on your extension.

💡

Pro tip: pin your extension to the Chrome toolbar for easy access by clicking the pin button.

Where is the manifest.json file?

Plasmo abstracts away the manifest file. The framework generates the manifest under the hood based on your source files and configurations you export from your code, similar to how Next.js (opens in a new tab) abstracts page routing and SSG with the file system and page components.

We will further abstract with auto-permissions and a needs-based permission scheme, removing the need to specify permissions manually! (Coming soon)

Next Steps

Go to the Extension Pages section to learn more about the different UI elements in a Plasmo extension and get inspiration. A modular example accompanies each workflow, showcasing the framework's simplicity. View examples on our GitHub repo (opens in a new tab).

Check out the Customization section for documentation on making Plasmo adapt to your needs.

To see how to integrate Plasmo with other tools (such as TailwindCSS or Firebase), check out the list of examples in the Quickstarts section.

Community

Find the Plasmo community on Discord (opens in a new tab). If you're stuck and want some help or looking to chat more about Plasmo and browser extensions, this is the place to be!

If you find a bug in the Plasmo Framework, please report it using our Bug Report Form.

Our Code of Conduct (opens in a new tab) applies to all Plasmo community channels.

Projects using Plasmo Framework

Cradle (opens in a new tab)
ArConnect (opens in a new tab)
MICE (opens in a new tab)
Hundreds of Repos on GitHub (opens in a new tab)
Many hundreds more on the Chrome Web Store

Welcome New Extension