Kosh is a lightweight, open-source bookmark manager that replaces the built-in Firefox bookmark UI with a modern, minimal interface focused on browsing, organizing, tagging, searching, and exporting existing bookmarks without any migration. It integrates directly with the browser’s native bookmark store, offers a clean dashboard and popup view, and emphasizes simplicity and speed. Key advertised features include a tidy UX, basic organization tools, tag support and search, and small install size; screenshots show a compact dashboard and quick-access popup for managing bookmarks.
The extension is GPL-3.0 licensed and available on GitHub and a project website; version 0.0.4 is 130.59 KB and was updated on Sep 26, 2026. Required permissions are read/modify bookmarks and read/modify download history plus download files; the developer states the extension does not collect user data and stores only extension settings. There are currently no user ratings or reviews. This is a practical option for users who want a simpler, open-source alternative to Firefox’s default bookmark manager, but note the download-history permission and the lack of community feedback so far.
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