Local Session Sync

Tracking since May 8, 2026.

Changelog

• May 12, 2026
  description

  Local Session Sync helps developers recreate authenticated browser sessions on localhost while working across dev, stage, UAT, and production-like environments.
  
  The add-on copies selected cookies from the active tab to configured localhost targets, such as http://localhost:3000/. It only runs when the user invokes it and requests source-site access at runtime.
  
  Features:
  - Clear and sync localhost cookies from the active tab.
  - Sync without clearing existing localhost cookies.
  - Clear configured localhost cookies without copying from the active tab.
  - Configure one or more localhost targets.
  - Include or exclude cookies by name substring, comma-separated names, one name per line, or regular expression.
  - Keep all cookie handling local in the browser.
  
  The add-on has no backend, analytics, advertising, tracking, or external data sharing. It does not bypass authentication or authorization checks; it only recreates compatible browser cookie state on localhost for development workflows.

  Stay logged in on localhost when you switch between dev, stage, UAT, and local proxy setups.
  
  Local Session Sync copies the cookies you choose from your current authenticated tab to localhost, so you can test locally without repeating login flows or manually moving cookies through DevTools.
  
  If this sounds familiar, this extension is for you:
  	•	You log in on dev, stage, or UAT.
  	•	You switch your local app or proxy to that environment.
  	•	Localhost is no longer authenticated.
  	•	You waste time digging through DevTools and manually copying cookies.
  Local Session Sync removes that friction.
  
  How it works
  	•	Open the environment where you are already logged in.
  	•	Use the extension and choose how cookies should be synced to localhost.
  	•	Refresh your local app.
  	•	Continue working with the same authenticated session.
  
  Best use cases
  	•	Switching your local proxy between multiple backends.
  	•	Testing features against dev, stage, and UAT without logging in again and again.
  	•	Running several local apps that need the same authenticated state.
  	•	Reproducing environment-specific behavior on localhost faster.
  
  What you can do
  	•	Copy cookies from the active tab to one or more localhost targets.
  	•	Clear localhost cookies before syncing for a clean session.
  	•	Sync cookies without clearing existing localhost cookies.
  	•	Clear configured localhost cookies without copying anything.
  	•	Filter cookies by substring, comma-separated names, one name per line, or regular expression.
  	•	Keep all cookie handling inside your browser.
  
  Privacy and security
  	•	No backend.
  	•	No analytics.
  	•	No ads.
  	•	No tracking.
  	•	No external data sharing.
  	•	Source-site access is requested only when you use the extension.
  
  Important
  Local Session Sync does not bypass authentication or authorization. It only recreates compatible cookie state on localhost for development and testing.
  Stop copying cookies manually. Reuse the session you already have and get back to building.

Permissions & access

Permissions

cookiesactiveTabcontextMenusstorage

Host access

http://localhost/*, https://localhost/*

Screenshots