A few things worth knowing.

Chrome and Edge version 121 or later are supported. Other Chromium browsers may work; Firefox and Safari do not support this extension.

Both the website and extension support Chinese, English, Japanese, Korean and Latin. The extension follows your browser language by default; open Settings in the lower left to choose and save a language.

After diagnosis, choose Coarse, Medium or Fine on the Organize card. Coarse combines the main site; Medium separates subdomains such as Gmail and other Google apps; Fine also separates Google Docs, Sheets, Slides and Excel, document or PDF files on the same host. Coarse is the default. Your choice is saved automatically and browser groups change when you organize. Fine recognizes document, spreadsheets, presentation and forms paths on docs.google.com, and .xls/.xlsx/.xlsm/.xlsb, .doc/.docx, .ppt/.pptx, .ods/.odt/.odp, .csv and .pdf at the end of a URL path. Other pages fall back to subdomains. Document IDs, query strings and hashes do not create groups. Single tabs stay ungrouped; saved collections keep their categories.

In Tabs, use the Ungroup button beside a site group heading to remove that site's browser grouping. This only removes browser grouping: it does not close, deduplicate, archive or explicitly move tabs. Search still applies to the site's full membership. Organize again to rebuild groups.

The complete URL must match, including the path, query and hash. Different routes remain separate. Page state such as unsent form input is not compared, so save your work before organizing.

No. Archives use KoiTab's own local collection. Browser bookmarks are displayed read-only. A saved entry is a link, not an offline webpage copy.

Pinned, active or navigating tabs are excluded, as are pages that do not meet the age threshold. Tabs that change while saving are also kept. Diagnosis explains why there are no eligible pages.

Before updating, use Settings → Export backup to save favorites and settings. Replace files in the original extension folder and reload it in the extensions manager, keeping the same folder and extension ID. After reinstalling, use Import backup to recover favorites.

There is no complete one-click undo. Browser history may help reopen closed pages, but window positions, groups and form input are not guaranteed to return. Review the diagnosis preview first.

No. KoiTab uses the current browser's local storage and has no account or cloud sync service.

Enable Developer mode and select the extracted folder that contains manifest.json. Managed browsers may prohibit manually loaded extensions; follow your administrator's settings.

Open Settings at the bottom left and choose Export backup to save a JSON file. To move to another browser or recover after reinstalling, choose Import backup, review new and duplicate counts, then confirm. Favorites merge by full URL, keeping existing entries. Select Also restore settings from the backup to restore language, organizing preferences and collapsed groups.