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SPECIFICTION
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Tab Session Manager

tab-session-manager.sienori.com

Free plan Browser extension
Visit tab-session-manager.sienori.com
Spec score 7.2 #14 of 19 in Browser Extensions

Spec sheet

Purpose
Tab Session Manager saves and restores browser windows and tabs, with automatic saving.Read 8 Oct 2026 · tab-session-manager.sienori.com
Support
The Firefox listing provides a support email and links to the maker’s homepage and support site.Read 8 Oct 2026 · addons.mozilla.org
Automatic saving
The extension can save automatically when a window closes and at regular intervals.Read 8 Oct 2026 · addons.mozilla.org
Autosave limit
The Firefox listing says the minimum interval for regular autosaving changed to 0.5 minutes due to Manifest V3 limitations.Read 8 Oct 2026 · addons.mozilla.org
Browser compatibility
The maker links to Chrome and Microsoft Edge versions, and the Firefox listing says it is compatible with the Chrome extension.Read 8 Oct 2026 · addons.mozilla.org
Cloud sync
Cloud sync can synchronize session data between computers using Google Drive.Read 8 Oct 2026 · tab-session-manager.sienori.com
Compression privacy
The maker says loaded session files in the compressor are not sent to the Internet.Read 8 Oct 2026 · tab-session-manager.sienori.com
Google Drive access
When Cloud sync is enabled, session data is stored in the Google Drive App Folder, which the policy says other apps and the maker cannot access.Read 8 Oct 2026 · tab-session-manager.sienori.com
Import and export
The extension supports importing and exporting sessions and importing Session Buddy data.Read 8 Oct 2026 · addons.mozilla.org
Imported URL favicons
The Import URL list feature uses Google’s API to retrieve favicons for imported URLs.Read 8 Oct 2026 · tab-session-manager.sienori.com
Local data storage
The privacy policy says session data is stored locally and is not sent to an external server unless Cloud sync is enabled.Read 8 Oct 2026 · tab-session-manager.sienori.com
Session compression
The maker provides a local tool to compress favicons in sessions saved by version 6.7.0 or earlier to reduce memory use.Read 8 Oct 2026 · tab-session-manager.sienori.com
Session management
Users can manage sessions with names and tags.Read 8 Oct 2026 · addons.mozilla.org
Tab groups
The extension supports saving tab groups.Read 8 Oct 2026 · addons.mozilla.org

Plans and prices

Free Free Save and restore sessions · Auto-save · Cloud sync · Import and export Read 8 Oct 2026 · addons.mozilla.org

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