TabSavior — one-click save of all tabs from all windows into tidy bookmark folders (first UI mockup, looking for feedback)

Hi everyone — I've started building TabSavior, a lightweight browser extension for Chromium-based browsers and Firefox. I'm at the design stage: the UI mockup linked below is done, and I want to pressure-test the concept with people who actually juggle lots of tabs before I write the code.

About the screenshot: https://imgur.com/NpdeyCB – this is my UI mockup, not the working extension yet. Left side is the popup you'd see when clicking the extension icon; right side is what your bookmarks would look like immediately after a save (new folder highlighted).

Problem I'm solving

When I work across many windows and tabs I often lose track of saved sessions. Existing tools sometimes:

• Store sessions only inside the extension (hard to find later),
• Require saving each window separately, or
• Produce inconsistent folder names that make finding and restoring awkward.

How TabSavior works

• One-click "Save all windows": save every tab from every window with a single action.
• Pattern-based bookmark folders: saves go into bookmark folders named by a template (date, window title, domain, tag), so they're predictable and visible in the browser's native bookmarks — you can see this in the mockup's right panel.
• Restore: preview a save and restore whole windows or selected tabs into a new window.
• Local-first (no cloud in the initial version); import from common session managers planned.

Example folder templates

• TabSaves/{YYYY-MM-DD}/{WindowTitle}
• TabSaves/{YYYY-MM-DD}/{PrimaryDomain}
• Research/{Tag}/{YYYY-MM-DD}/{WindowTitle}

Why I think this helps

• Bookmarks are portable and searchable through the browser, so you don't lose sessions if an extension breaks or is removed.
• Template-based naming avoids unnamed or confusing session dumps.
• A single global save is faster than saving each window manually.

What I'd love feedback on

1. Would you prefer saves to go into native bookmarks (like in the mockup), or to an extension-managed session list?
2. Which default templates would be most useful for you? (date + window title, date + domain, tag-based, other)
3. How important is scheduled automatic saving / retention to you?
4. What's your biggest frustration with current tab/session managers?

Thanks — honest feedback welcome, including "this already exists, use X."