Extensions

Manage Chrome extensions for your Kernel browsers.

When to Use

Use this skill when you need to:

• Block ads or trackers during web scraping to improve performance
• Auto-login to websites using authentication extensionsz
• Test browser extensions in automated environments
• Add custom functionality to browsers via extensions
• Download extensions from Chrome Web Store for use with Kernel
• Manage extension lifecycle (upload, list, download, delete)

Prerequisites

See prerequisites.md for Kernel CLI setup.

List Extensions

View all extensions in your organization:

kernel extensions list

With JSON output:

kernel extensions list -o json

Upload Extension

Upload an unpacked extension directory:

kernel extensions upload ./my-extension

# Upload with custom name
kernel extensions upload ./my-extension --name my-ext

# Upload with JSON output
kernel extensions upload ./my-extension --name my-ext -o json

Download Extension from Chrome Web Store

Download and unpack an extension directly from the Chrome Web Store:

kernel extensions download-web-store "https://chromewebstore.google.com/detail/extension-id" --to ./my-extension

# Specify target OS (mac, win, or linux)
# If uploading to a kernel browser, the target OS should be linux
kernel extensions download-web-store "https://chromewebstore.google.com/detail/extension-id" --to ./my-extension --os mac

Download Extension

Download and extract an extension by ID or name to a directory:

kernel extensions download my-ext --to ./downloaded

Note: The extension will be extracted to the specified directory (not saved as a zip file).

Delete Extension

# Delete with confirmation prompt
kernel extensions delete my-ext

# Delete without confirmation
kernel extensions delete my-ext --yes

Example: Download and Upload AdGuard Extension

# 1. Download AdGuard from Chrome Web Store
kernel extensions download-web-store \
  "https://chromewebstore.google.com/detail/adguard-adblocker/bgnkhhnnamicmpeenaelnjfhikgbkllg" \
  --to ./extensions/adguard

# 2. Upload to Kernel
kernel extensions upload ./extensions/adguard --name adguard

# 3. Create a browser with the extension
kernel browsers create --extension adguard

# 4. Verify upload
kernel extensions list

Example: Use Extension with Browser

After uploading an extension, you can use it with browsers. See the browser management commands for details on loading extensions into browser sessions.

# Create browser with extension
SESSION=$(kernel browsers create -o json | jq -r '.session_id')

# Use browser with automation
kernel browsers playwright execute $SESSION 'await page.goto("https://example.com")'

MCP Tool: Use kernel:execute_playwright_code for playwright execution.

Use Cases

• Ad blocking: Block ads during web scraping
• Authentication: Use auto-login extensions
• Testing: Test browser extension functionality
• Custom automation: Deploy custom extensions