A Firefox sidebar extension that integrates with OpenCode. Helpful for adding browser context to prompts.
- Tab Context — Select open browser tabs to include their content as context.
- Workspaces
- Select a directory on your filesystem to scope the agent's changes to.
- Sessions are automatically scoped to workspaces, keeping project conversations separate
- Switch between recently used workspaces with configurable history.
- OpenCode Basic Auth support - Supports auth via
opencode serve OPENCODE_SERVER_PASSWORD=<pwd>. - Developer Mode - View context sent with each message and clear sessions.
- Firefox 109 or later
- OpenCode server running locally (default:
http://localhost:4096)
addons.mozilla.org submission is pending
git clone https://github.com/anomalyco/opencode-firefox.git
cd opencode-firefox
npm install- Start the OpenCode server:
opencode serve - In a terminal run the dev build
npm run dev - In another terminal run the extension
npx web-ext run - In the browser open the extension sidebar and click the OpenCode icon
- (Optional) Set a workspace directory by clicking the 'Set workspace' button
- Select browser tabs to include as context
- Type your prompt and press Enter or click Send
Click the settings gear icon to configure:
- Server URL — OpenCode server address (default:
http://localhost:4096) - Server Username — Authentication username (default:
opencode) - Server Password — Authentication password
- Workspace History Size — Number of recent workspaces to remember (default: 5)
- Developer Mode - toggle advanced developer-related tools
This extension stores data locally in your browser only:
- Workspace paths — Stored in
browser.storage.localfor quick re-selection - Session IDs — Mapped to workspaces in
browser.storage.localto keep conversations scoped - Server credentials — Stored in
browser.storage.localto avoid re-entering on each session
No data is sent to any server other than your local OpenCode instance. The extension does not collect, transmit, or share any telemetry or usage data.
MIT