Developer browser extension

local-session-sync.artinski.dev

Local Session Sync

Copy authenticated browser sessions from remote environments to localhost. Built for frontend developers who need local apps to work against remote authenticated environments without repeating login flows all day.

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Local Session Sync extension popup
Use case

Built for local frontend work with remote auth.

A Chrome-compatible Manifest V3 extension for developers who run a local frontend while auth, backend or identity systems live on dev, stage, UAT or production-like environments.

Copy selected cookies from the active tab to localhost targets.

Clear stale localhost cookies before syncing when switching environments.

Configure localhost ports, include filters and exclude filters.

Request source-site access only when the extension is used.

Keep all cookie handling local in the browser with no backend or analytics.

Workflow

Sync only when you ask it to.

  1. 01Open an authenticated remote environment.
  2. 02Run Local Session Sync from the extension popup or action menu.
  3. 03Copy selected cookies to one or more localhost targets.
  4. 04Refresh the local app and continue testing against the remote backend.
Install

Prepared for store submission and local installation.

  1. 01Download the extension package.
  2. 02Open chrome://extensions in Chrome or another Chromium-based browser.
  3. 03Enable Developer mode.
  4. 04Choose Load unpacked and select the unpacked extension directory.
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Privacy and limits

Cookie handling stays inside the browser.

Local Session Sync has no backend, analytics, advertising or external data sharing. It reads cookies from the active tab only after the developer invokes it and grants access when required.

cookies

Reads source cookies and writes matching cookies to configured localhost targets.

activeTab

Identifies the tab the developer intentionally runs the extension from.

contextMenus

Adds quick actions for copying or replacing localhost session cookies.

storage

Stores localhost targets, filters and last-run status locally in the browser.

The extension does not bypass authentication or authorization checks.

Server-side session validation, token audience rules and SameSite behavior still apply.

Partitioned cookies are skipped because their top-level-site partition cannot be safely reused for localhost.