v1.6.4: Added Zen Browser workspace backup and restore. Each Zen workspace is now saved as a separate bookmark folder and restored with the correct Firefox container (requires zen.workspaces.force-container-workspace to be enabled in about:config). Added a new "Restore groups as collapsed" option in Backup settings. No build step required.

v1.6.2: Fixed critical Chrome bug where BrowserDetect failed to load in service worker, causing "No open tabs to backup" and "Restore failed: BrowserDetect is not defined" errors. Fixed extra blank tabs opening during restore — window now opens with first bookmark URL directly. Improved tab group restore reliability with try/catch error handling. Updated all 18 locale translations. Added MIT LICENSE file.

v1.6.1: Restored tabGroups permission for Firefox/Zen Browser compatibility. Tab groups are now correctly saved as bookmark folders. Also includes security improvements (innerHTML replaced with safe DOM APIs) and data_collection_permissions declaration.