ZenSync

Minimal background sync for a Zen Browser profile via a private GitHub repo.

ZenSync is designed for one active computer at a time: close Zen on one machine, let ZenSync push a final snapshot, then open Zen on another machine and it pulls the latest snapshot. While Zen is open, ZenSync also makes lightweight live checkpoints as a fallback if a laptop sleeps or shuts down before Zen can close cleanly.

What syncs

• Zen settings and UI customizations
• extensions and extension metadata
• bookmark backups
• closed-browser session files used to restore tabs/workspaces
• live tab/session checkpoints while Zen is open, marked clearly as non-final

What does not sync

ZenSync intentionally excludes sensitive or high-conflict data:

• passwords and encryption keys (logins*, key4.db, cert9.db)
• cookies / login sessions (cookies.sqlite)
• site storage (storage/)
• browsing history database (places.sqlite)
• form/autofill data
• caches, locks, telemetry, crash reports, DRM/media plugin state

Note: synced tab/session files can still contain page URLs and tab titles. Keep the profile repo private.

Install / update ZenSync

Source install today:

git clone https://github.com/gustavonline/zen-sync.git ~/zen-sync
cd ~/zen-sync
npm install
npm link

NPM install:

npm install -g @gustavonline/zen-sync

If you previously installed the older alias, remove it too:

npm uninstall -g @gustavonline/zensync

To update a source install:

cd ~/zen-sync
git pull --rebase
npm install
npm link
zensync restart

To update an npm install (recommended):

zensync update

Manual equivalent:

npm install -g @gustavonline/zen-sync
zensync restart

The background watcher checks for new npm versions and notifies you with the update command.

First setup on any machine

1. Open Zen Browser once, then close it.
2. Run:

zensync setup

Setup now starts with preflight checks for Git, GitHub CLI (gh), and Git identity before it changes anything. It then configures the profile, enables launch-on-login, and starts/restarts the background watcher.

During setup:

• On the first/original machine, choose Start brand-new repo and optionally import your local Zen profile.
• On additional machines, choose Connect to existing repo and paste the profile repo URL, e.g. https://github.com/gustavonline/zen-profile-data.git.
• If you picked the wrong path earlier, just run zensync setup again — the wizard can now keep the current repo, replace it with a clone, or recreate it with a backup first.

ZenSync points Zen directly at ~/zensync-data/profile and then keeps that repo synced in the background.

Daily use

• Do not run Zen on two machines at the same time.
• Close Zen on the current machine before opening it on another machine.
• ZenSync pushes a Final Sync (Closed) commit when Zen closes.
• While Zen is open, ZenSync may push Live Checkpoint commits. They are fallback snapshots, not clean finals.
• While Zen is closed, ZenSync pulls remote changes every few seconds so the next launch is fresh.
• If the newest remote commit is only a live checkpoint, ZenSync logs/notifies you so you know the other machine was probably slept/shut down without closing Zen.

Useful checks:

zensync status
zensync logs -n 30

Platform notes

• Windows: startup uses a hidden Startup-folder shortcut.
• macOS: startup uses a LaunchAgent.
• Linux: startup uses a systemd user service. Native Zen uses ~/.zen; Flatpak profiles are detected under ~/.var/app/....

More details: docs/setup.md.