Last updated: 2026-07-27
Browser State Sync is a browser extension that lets you export and restore a
website’s cookies, localStorage, and sessionStorage to and from a JSON
file on your own computer.
Browser State Sync does not collect, transmit, sell, or share any data. It has no servers, no analytics, and no third-party network calls of any kind. Everything the extension reads (cookies, storage, tab URLs) stays on your device for the duration of the popup being open, and is only written to disk when you explicitly click “Export.”
| Data | Accessed when | Where it goes |
|---|---|---|
| Cookies for the active tab’s site | You open the Cookies tab, or export/restore | Held in memory in the popup; written to a local .json file only if you click Export |
localStorage / sessionStorage for the active tab’s site |
You open the Storage tab, or export/restore | Same as above |
| Active tab’s URL | Used to label exported files and to show which site you’re working with | Never leaves your device |
| Extension settings (theme, export/restore preferences) | Saved automatically when you change a setting | Stored locally via chrome.storage.local; never transmitted anywhere |
The extension only acts on the tab you currently have open, and only after you grant the relevant optional permission (see docs/Permissions.md). It does not run in the background on pages you haven’t interacted with.
None. There is no backend, no analytics SDK, and no third-party code that this extension talks to. Exported files are saved directly to your Downloads folder using the browser’s standard download mechanism; imported files are read directly from disk using the standard file picker. At no point does the extension upload this data anywhere.
The extension itself does not retain any of your cookies or storage data
between popup sessions — it re-reads the current tab’s data each time you
open the popup. Exported .json files are yours: they live wherever you
saved them, and deleting them or uninstalling the extension removes
everything the extension had access to.
If this policy changes, the updated version will be published in this file and the “Last updated” date above will change accordingly.
For questions about this policy, please drop an email at: socialrajesh211@gmail.com