Lastbrowser Support & FAQ

1. How do I configure Lastbrowser as my Windows default browser?

Lastbrowser registers official handlers for standard protocols (http, https) and HTML files:

1. Open Lastbrowser Settings (gear icon in the sidebar or press Ctrl+,).
2. Under System & Integration, click the "Set as Default Browser" button.
3. Windows opens the Default apps panel. Select Lastbrowser and confirm Set default.

Thanks to the built-in single-instance lock, opening links in external apps (emails, Slack, Teams) will automatically dispatch new tabs to your running browser window.

2. What keyboard shortcuts are supported?

Lastbrowser is optimized for rapid, keyboard-centric productivity:

• Ctrl+K / Cmd+K: Opens the Universal Command Palette (spotlight navigation across tabs, tools, and sidekick actions).
• Ctrl+B: Toggles sidebar state (Expanded 240px ↔ 48px Slim Dock ↔ 0px Zen Full-Canvas mode).
• Ctrl+1 through Ctrl+8: Instantly jumps to the corresponding pinned web app (WhatsApp, Discord, Figma, etc.).
• Ctrl+Shift+N: Opens a new Private / Incognito window with isolated in-memory storage.
• Ctrl+T: New Tab  |  Ctrl+W: Close Tab  |  Ctrl+Tab: Switch Tab.
• F11: Enter or exit full-screen mode.

3. Which AI models are supported and how does authentication work?

Lastbrowser follows an uncompromising Bring-Your-Own-Key (BYOK) and local-first architecture:

• Google Gemini CLI (Recommended): Directly reads your local authentication from ~/.gemini/credentials.json. Features multi-account round-robin with auto-failover, defaulting to gemini-3.8-flash.
• Personal API Keys: Easily configure your own API keys for Anthropic Claude (Claude 3.5 Sonnet / Opus) or OpenAI (GPT-4o / o3-mini) in the settings panel.
• Local Offline LLMs: Connect to locally running Ollama or LocalAI servers for 100% offline, private AI assistance.

4. How do I install WebExtensions (Chrome Add-ons)?

Lastbrowser features native support for modern Chrome Manifest V3 WebExtensions:

• Open the "Extensions & Add-ons" panel from settings or via the puzzle piece icon in the browser titlebar.
• Browse our curated 1-click store to instantly enable essentials like Dark Reader, uBlock Origin Lite, Bitwarden, and ClearURLs.
• Developers can load unpacked extensions from any local folder containing a valid manifest.json.

5. Where is my browsing data saved and how do I back it up?

All your profiles, history, bookmarks, passwords, and SQLite caches remain strictly local on your machine:

%APPDATA%\Lastbrowser (e.g., C:\Users\<Username>\AppData\Roaming\Lastbrowser)

To back up your configuration, simply copy this folder while Lastbrowser is closed.

6. How do I clear browsing data or cleanly uninstall Lastbrowser?

You have full authority over your data lifecycle:

• Clear Browsing Data: Access the Clear Browsing Data dialog via History or System Settings to wipe cache, cookies, local storage, and history in seconds (complying with Microsoft Store Policy 10.2).
• Clean Uninstaller: When running the Windows uninstaller, choose Yes when asked if you wish to remove your user profile data from %APPDATA%\Lastbrowser.

7. What should I do if I encounter runtime or connection errors?

Lastbrowser includes an automated diagnostics tool:

• Open the ConPTY Terminal inside Lastbrowser and run sidekick doctor.
• The doctor checks Python runtimes, Node.js, port allocations, and SQLite databases, and provides instant 1-click auto-fixes.