Markleaf: Bookmark Manager by Baki Nazik

It's also open source!

Source code: https://github.com/bakinazik/markleaf
Website: https://bakinazik.github.io/markleaf/

Features:

• List and grid layout
• Create: Folder and bookmark/current page
• Edit: URL and name
• Draggable sorting for folders and bookmarks
• Pin bookmarks and folders to keep them grouped at the top
• Dynamic search across all bookmarks or only within a folder, with keyboard navigation
• Settings search with quick filtering
• Theme support: light / dark / black / system, plus custom (fully adjustable colors)
• Custom extension icon (4 predefined styles: colorful / black / white / gray, or upload your own)
• Root folder selection (Bookmarks Bar / Other Bookmarks)
• Remember last visited folder
• New item position: add new bookmarks to the start or end of a folder
• Supports 17 languages
• Trash: deleted items are recoverable, with configurable auto-expiry
• Multi-select with bulk open, move, and delete
• Folder style: classic icon or favicon collage preview
• Folder badge: shows bookmark count on folder
• Grid view customization: column count, item width, and title visibility
• Customizable context menu with drag and drop reordering
• Import and export bookmarks and settings as JSON or Netscape HTML, with selectable scope
• Scroll-to-top button, with toggle to show/hide
• Toggle to show/hide quick actions
• Toggle to show/hide the scrollbar
• Breadcrumb navigation with up button and drag-to-move support
• Favicon provider selection (Browser / Google / DuckDuckGo)

Shortcuts:

• Up - Down - Left - Right: Navigate through the list
• Enter: Open selected item or enter folder
• Left - Tab: Go to parent folder
• Left click: Open in current tab
• Right click: Open context menu
• Middle click: Open in new tab
• Ctrl + click: Open in new tab or move the bookmark
• Shift + click: Open in new window