Why not just Chrome's native vertical tabs?

Feature comparison

Capability	Chrome Native	Sidebar for Tabs/Bookmarks
Vertical tab list	✅	✅
Tab groups	✅	✅
Bookmarks in the same panel	❌	✅
Reading List integrated	❌	✅
RSS subscriptions	❌	✅
Cross-window tab view	❌	✅
Workspaces (hibernate + restore, cross-device)	❌	✅
AI auto group naming	❌	✅ Local Gemini Nano
AI tab cleanup suggestions	❌	✅ Local Gemini Nano
AI hover summary	❌	✅ Local Gemini Nano
AI Reading List summary memory	❌	✅ Local Gemini Nano
Ask AI (natural-language find)	❌	✅ Local Gemini Nano
Bookmark Tools (tags / dedupe / dead-link)	❌	✅
Command Palette (⌘K)	❌	✅
Custom theme + background image	❌	✅
Performance with 1000+ bookmarks	N/A	⚡️ Dynamic Rendering
API key required	N/A	❌ Not required (optional BYO key)
Local & offline	✅	✅ By default

Unify your information sources. Native vertical tabs are tabs only. Sidebar for Tabs/Bookmarks puts tabs, bookmarks, and your reading list (with optional RSS subscriptions) in one panel with one search, so you stop alt-tabbing between Chrome's separate bookmark / reading managers.
Hibernate-and-restore Workspaces. Save a bundle of tabs as a named workspace, one click hibernates everything and opens another workspace's saved tabs. Workspace metadata syncs across devices (snapshots stay on-device for performance + privacy).
Free, local-by-default AI. Chrome ships Gemini Nano in 2025+; this extension puts it to work — auto-name new tab groups, suggest tabs to close, hover a tab for a one-sentence page summary, or ask the palette in natural language: "the React Hooks article I read last week." No API key needed by default and nothing leaves your machine; optionally bring your own key for cloud models (Gemini API / Claude / OpenAI-compatible / Ollama).