CrabCode in Chrome · Extension mode

Install the CrabCode browser extension

This page installs the extension backend for browser automation. Regular automation defaults to playwright-cli CLI mode; use this extension mode when you need real Chrome login state, OAuth/SSO, or intranet pages.

Download extension ZIP Read browser automation docs

chrome://extensions

CrabCode in Chromemanifest v3 · nativeMessaging

0.1.0

Extension nameCrabCode in Chrome

ManifestMV3

BridgeNative Messaging

Built-in guide routehttp://127.0.0.1:<dynamic-port>/browser-extension/

Download routehttp://127.0.0.1:<dynamic-port>/browser-extension/download

Package filenamecrabcode-browser-extension.zip

After unzipping, you get a browser-extension/ folder containing manifest.json, serviceWorker.js, contentScript.js, and sidePanel.html.

Download and unzip the package

Download crabcode-browser-extension.zip, unzip it, and keep the browser-extension/ folder. Chrome keeps reading the unpacked extension from this folder, so keep it in a stable location.

Load the unpacked extension in Chrome

Open chrome://extensions, turn on Developer mode, click Load unpacked, then select the unzipped browser-extension/ folder.

Copy the extension id shown by Chrome

Chrome shows a 32-character id on the extension card. If CrabCode still reports aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, it is using the placeholder id and needs the real id shown in Chrome.

Set the environment variable and restart CrabCode

Set CRABCODE_CHROME_EXTENSION_ID and restart CrabCode. On restart, the native host manifest writes the new allowed_origins, allowing the extension to connect.