Extension.devPlatform documentation

Build, preview, release and publish browser extensions for Chrome, Firefox and Edge from one project. Safari and the App Store are one paid lane.

Quickstart

What is Extension.dev

Open the console

Three ways to start

From a template, from a repository you already have, or from the theme builder. Import also accepts a generated artifact.

Ways to start

One project, every browser

Connect a repository once. Every push builds one artifact per browser from the same commit.

Projects

Channels before stores

Promote a tested build through the channels you define before any store review sees it.

Release channels

Show a build without a zip

Hand a reviewer a link that runs your build in their browser. They install nothing and sign in to nothing.

Share a build for review

Store credentials held once

Credentials live in the project, not in the command. Submissions dispatch from the console, from CI, or from an agent.

Publishing

Push to build

A push builds your extension, an armed release promotes itself when the build goes green, and the store sweep reports back.

CI and git deploys

Agent tools

An MCP server for the verbs and an agent skill for the judgment, from create to store submission.

MCP server

Predict the invoice

Free runs Chrome, Firefox and Edge by hand, plus 25 push builds a month. Paid adds the Safari lane and builds on every push, release and API call, stated in one table.

Pricing