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    Browser Extension: Install and Troubleshoot

    Setup Guide

    Install the LinkedIn extension, sign in, fix sync issues, and verify monitoring.

    By Sebastian StreiffertPublished Jan 10, 2026Updated May 29, 20265 min read

    What the extension does

    The Lumenbase browser extension (Chrome or Brave) syncs LinkedIn messages, supports profile capture, and powers LinkedIn activity monitoring when combined with Codex settings. It runs only while you are signed in and LinkedIn is open in a tab you use.

    Install and sign in

    1

    Install

    From Settings → My Settings → Integrations → LinkedIn, follow the install link for Chrome/Brave. Pin the extension for easier access.
    2

    Sign in

    Open the extension popup and sign in with the same Lumenbase account you use in the app.
    3

    Grant site access

    Allow the extension on linkedin.com. If LinkedIn features are greyed out, check browser extension permissions for this site.

    Verify it is working

    • LinkedIn Monitor (Labs) shows “extension connected” instead of a warning banner.
    • New LinkedIn messages can appear on contact timelines after sync.
    • Codex Activity monitoring requires a Codex linked to lists — see the Codex guide.
    Full setup for Monitor, My Connections, and Added Profiles: LinkedIn Monitor guide.

    Troubleshooting

    Extension not detected

    1. Confirm the extension is enabled in chrome://extensions (not disabled or removed).
    2. Use Chrome or Brave — other browsers are not supported.
    3. Sign out and back in via the extension popup.
    4. Reload LinkedIn and the Lumenbase app tab.

    Messages or activity not syncing

    1. Check LinkedIn integration is connected under My Settings → Integrations.
    2. For post activity, enable Activity monitoring on the relevant Codex.
    3. Ensure the contact is on a list linked to that Codex.
    4. Keep a LinkedIn tab open while monitoring runs.

    Wrong workspace

    Sign out in the extension and sign in again with the correct Lumenbase account.

    Install: My Settings → Integrations → LinkedIn
    Monitor status: Labs → LinkedIn Monitor
    Message sync: Article: Integrating with LinkedIn

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