What Is Tab Session Manager and What Does This Website Offer?

Updated

Tab Session Manager is a browser WebExtension that saves and restores the state of windows and tabs, and it also supports automatic saving. The site at tab-session-manager.sienori.com is its official information and download page, maintained by developer sienori and published with GitHub Pages. It suits people who frequently keep many tabs open and want a way to recover a window layout after closing the browser, a crash, or a restart.

What the extension does

The core function is straightforward: it captures the current set of open windows and tabs as a session, and later restores that state. According to the site, it also supports automatic saving, so sessions can be captured without a manual action each time.

This is useful in situations such as:

  • Closing a browser with dozens of research tabs and reopening the same set later
  • Recovering a working layout after an unexpected shutdown
  • Keeping separate saved sessions for different projects or tasks

What the website provides

The page is a landing and resource hub rather than a web app you use in the browser. Its main sections are:

Section What it offers
Download A download link for Microsoft Edge
Tools Session Compressor, a tool for compressing Tab Session Manager sessions
Tools Save Tab Groups, an additional extension for saving tab groups in Tab Session Manager for Chrome
Backers / Sponsors Recognition of supporters, with an invitation to become a sponsor
Translation A Crowdin link for contributing translations
Developing Build instructions for running the extension from source
Privacy Policy The extension's privacy policy

The download section on the page specifically points to Microsoft Edge. The site does not list pricing or payment details, so no cost or free-of-charge claim should be assumed from the page alone.

Who it is for

The extension fits users who treat open tabs as working context and want that context to survive browser restarts. If you only ever keep a handful of tabs and close them deliberately, the automatic saving and session restore features add little. If you routinely accumulate large tab sets across multiple windows, the save/restore model and the companion Session Compressor tool are the relevant parts of the offering.

For developers and contributors

The page documents a local development workflow: clone the GitHub repository, create a src/credentials.js file exporting a clientId, run npm install and npm run watch-dev, then load the unpacked extension from dev/chrome in Chrome via chrome://extensions with Developer Mode enabled, or load dev/firefox as a temporary add-on via about:debugging in Firefox. Translation contributions go through Crowdin.

Practical next step

If you use Edge and want session saving, start with the Download link on the page. If you use Chrome and rely on tab groups, check the Save Tab Groups add-on listed under Tools. For large saved sessions, Session Compressor is the companion utility the site points to.