Open-source AI browser agent for chatting with pages, automating tasks, and running multi-step workflows with your choice of LLM.
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WebBrain is a web browser extension that puts an AI agent in a side panel next to your tabs. Ask it about the page you're on, or hand it a task and let it click, type, and navigate its way through. It runs on the model you choose — a local llama.cpp or Ollama server, a frontier cloud API, or the managed default that needs no setup at all.
Install from the Chrome Web Store, Firefox Add-ons, or Edge Add-ons.
Or load it from source
git clone https://github.com/webbrain-one/webbrain.gitChrome — open chrome://extensions/, enable Developer mode (top
right), click Load unpacked, and select the webbrain/src/chrome folder.
For an isolated copy that won't pick up stray working-tree files, run
npm run build:chrome first and load webbrain/build/chrome instead.
Firefox — open about:debugging#/runtime/this-firefox, click Load
Temporary Add-on, and select src/firefox/manifest.json (or
build/firefox/manifest.json after npm run build:firefox). Temporary add-ons
are removed when Firefox restarts; permanent installation requires signing via
addons.mozilla.org.
Click the WebBrain icon to open the side panel, then type something like:
- "Summarize this page"
- "Find all links about pricing"
- "Fill in the search box with 'AI agents' and click Search"
- "Navigate to github.com and find trending repositories"
Three modes control what the agent is allowed to do:
| Mode | What it can do |
|---|---|
| Ask | Read-only. Reads the page, answers questions, fetches URLs. |
| Act | Clicks, types, navigates, uploads, downloads, fills forms. |
| Dev | Adds page source, styles, console, network, and reversible page edits. |
WebBrain Compass 1.0 is the default and needs no API key or local setup.
Local models need no API key either. Point WebBrain at any OpenAI-compatible server: