plugin-browser

@elizaos/plugin-browser

Browser automation and companion bridge plugin for elizaOS. Adds the BROWSER action and MANAGE_BROWSER_BRIDGE action to any Eliza agent, owns the Eliza browser workspace (electrobun-embedded BrowserView on desktop, JSDOM fallback on web/mobile), and manages the Chrome/Safari Agent Browser Bridge companion extension.

What this plugin provides

Actions

BROWSER — Controls a registered browser target. The agent picks the best available backend automatically, or you can pin a specific target with the target parameter. Supported operations:

action value	What it does
open	Open a URL in a new tab
navigate	Navigate an existing tab to a URL
click	Click a DOM element by CSS selector
type	Type text into a selector
press	Press a keyboard key
get	Get a DOM value
state	Return current tab state (URL, title)
snapshot	Capture a DOM snapshot
screenshot	Capture a screenshot
reload	Reload the current tab
back / forward	Browser history navigation
close	Close a tab
show / hide	Show or hide the browser window
wait	Wait for a selector to appear
tab	Tab management (list/new/close/switch)
realistic_click	Animated cursor click (visible to user)
realistic_fill	Animated fill with per-character delay
realistic_type	Animated typing
realistic_press	Animated key press
cursor_move	Animate cursor to a position
cursor_hide	Hide the cursor overlay
autofill_login	Fill saved credentials into a browser tab (vault-gated; requires domain)

MANAGE_BROWSER_BRIDGE — Manages the Chrome/Safari companion extension. Subactions: install (build + reveal + open manager), reveal_folder (open the build folder in Finder/Explorer), open_manager (chrome://extensions), refresh (report paired companions and settings). Owner-only.

Browser targets

The plugin uses a pluggable target registry in BrowserService. Targets are selected automatically by availability and score:

Target ID	Backend	When available
workspace	Electrobun BrowserView (desktop) or JSDOM (web)	Always
bridge	Paired Chrome/Safari via companion extension	At least one companion paired
stagehand	Playwright/Stagehand via HTTP endpoint	ELIZA_BROWSER_STAGEHAND_COMMAND_URL or STAGEHAND_SERVER_URL set

External plugins can register additional targets by calling BrowserService.registerTarget(target).

Provider

browser_workspace — Injects the current dispatch mode (desktop / web) and a capped list of open tabs into agent context. Active when the browser or web context is selected.

Routes

/api/browser-bridge/* — HTTP surface for the companion extension: pairing, settings, tab sync, page-context ingest, session progress, and extension package build/download.

Requirements

Auto-enable

The plugin is opt-in. It activates when config.features.browser is truthy in the elizaOS agent config:

{
  "features": {
    "browser": true
  }
}

Environment variables

Variable	Purpose
ELIZA_BROWSER_STAGEHAND_COMMAND_URL	Full URL for the Stagehand command endpoint
STAGEHAND_SERVER_URL	Stagehand base URL (commands go to <url>/api/browser-command)
ELIZA_BROWSER_STAGEHAND_URL	Alias for STAGEHAND_SERVER_URL
ELIZA_BROWSER_STAGEHAND_AUTO_SETUP	Set false to disable automatic stagehand-server install/build
ELIZA_BROWSER_ALLOW_STAGEHAND_ON_MOBILE	Set true to allow stagehand target on mobile
ELIZA_MOBILE_PLATFORM / ELIZA_PLATFORM / CAPACITOR_PLATFORM	Platform hint for target scoring (ios/android/mobile)

Vault keys (set by the user, not env vars)

autofill_login only fires when the user has pre-authorized it per domain:

• creds.<domain>.:autoallow = "1" — set via Settings → Vault → Logins.

Without this flag, the action returns an error rather than prompting interactively.

Companion extension authentication

Companion-scoped endpoints require two headers:

X-Browser-Bridge-Companion-Id: <companion uuid>
Authorization: Bearer <pairing token>

Legacy header aliases (X-LifeOps-Browser-Companion-Id, x-eliza-browser-companion-id) are not accepted.

Database

Drizzle tables in the browser PostgreSQL schema (applied by elizaOS plugin-sql migrator):

• browser_bridge_companions
• browser_bridge_settings
• browser_bridge_tabs
• browser_bridge_page_contexts

Registering a custom browser target

Any plugin can extend the browser dispatch surface at runtime:

import { BrowserService, BROWSER_SERVICE_TYPE } from "@elizaos/plugin-browser";
import type { BrowserTarget } from "@elizaos/plugin-browser";

const myTarget: BrowserTarget = {
  id: "my-target",
  name: "My Browser",
  description: "Custom browser backend.",
  kind: "external",
  priority: 50,
  available: async () => true,
  execute: async (command) => { /* ... */ },
};

const browserService = runtime.getService<BrowserService>(BROWSER_SERVICE_TYPE);
browserService?.registerTarget(myTarget);