Personal Notes for LinkedIn

A simple browser extension that lets you write private notes on any LinkedIn profile — stored locally in your browser, never sent anywhere.

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Note: Notes are stored in plain text and are not encrypted. Anyone with access to your browser profile or sync data can read them.

This is an independent project and is not affiliated with, endorsed by, or sponsored by LinkedIn.

Features

Inline notes

A notes textarea appears directly on every LinkedIn profile page (linkedin.com/in/…). Type your note and click Save Notes. The note reappears whenever you visit that profile again.

Notes viewer

Click the extension icon in your browser toolbar to open a full-page notes viewer. From there you can:

• Browse all saved notes in a searchable, sortable table (name, username, note content)
• Search across name, username, and note text
• Sort by any column
• Open a profile directly from the table
• Copy a note to the clipboard
• Delete individual notes
• Export all notes to a JSON file (for backup)
• Import notes from a previously exported JSON file (merges with existing notes, overwrites duplicates)
• File sync (Chrome / Edge only) — link a local JSON file that updates automatically every time a note changes, so you always have an up-to-date plain-text backup on disk

Cross-browser

Works on Chrome, Edge, and Firefox.

Privacy

All notes are stored using the browser's built-in storage.sync API. If you are signed in to browser sync, notes are synced across your own devices — they are never sent to any external server.

Notes are stored in plain text and are not encrypted. Treat them like any other local browser data.

The extension only runs on *.linkedin.com pages. You must grant the extension access to the LinkedIn domain when prompted by your browser.

Verifying this yourself: The extension has no network permissions in manifest.json — it only declares the storage permission. The two relevant source files are content.js (runs on LinkedIn pages, reads/writes notes) and src/background.js (opens the notes viewer tab when you click the icon). There is no analytics, telemetry, or external requests of any kind.

Storage limits

Each note is capped at roughly 8 KB (browser storage.sync per-item quota). The extension will warn you if a note exceeds this limit.

Exported and synced backup files are JSON and are also plain text. Store them somewhere you trust.

Installation

Chrome / Edge (from the Chrome Web Store)

Firefox (from Firefox Add-ons)

Manual install (developer mode)

Chrome / Edge:

1. Download the latest zip and unzip it, or clone this repository
2. Go to chrome://extensions and enable Developer mode
3. Click Load unpacked and select the unzipped folder
4. When prompted, allow the extension to access linkedin.com

Firefox:

1. Download the latest Firefox zip and unzip it, or clone this repository
2. Go to about:debugging#/runtime/this-firefox
3. Click Load Temporary Add-on and select manifest.json inside the folder
4. When prompted, allow the extension to access linkedin.com

Firefox temporary add-ons are removed when the browser restarts. For a persistent install in standard Firefox, install the signed version from Firefox Add-ons once published.

Contributing

The extension has no build step — it's plain JS, HTML, and CSS, loadable directly as an unpacked extension.

Key files:

File	Role
content.js	Injected into LinkedIn pages — detects profile pages, injects the notes UI, reads/writes storage
src/background.js	Service worker — opens the notes viewer tab when the toolbar icon is clicked
pages/notes-viewer.html/js/css	Full-page notes viewer (search, sort, export, import, file sync)
content.css	Styles for the injected notes UI
manifest.json	MV3 manifest (Chrome/Edge primary; Firefox via browser_specific_settings)

Cross-browser API: All storage and browser calls use const browserAPI = typeof browser !== 'undefined' ? browser : chrome (defined in src/shared.js). Never use chrome.* directly.

Storage key: browser.storage.sync, keyed by the LinkedIn member ID extracted from the page. Each entry stores { notes, username, memberId, name, createdAt, updatedAt }, where the timestamps are ISO 8601 strings.

Loading for development:

• Chrome/Edge: chrome://extensions → Developer mode → Load unpacked
• Firefox: about:debugging → Load Temporary Add-on → select manifest.json
• Or use npx web-ext run for Firefox with auto-reload