Add multi-tab support to scratchpad

README.md

@@ -1,13 +1,14 @@
 # Scratchpad - Firefox Extension
 
-A simple, synced scratchpad extension for Firefox that lets you quickly jot down notes that automatically sync across all your Firefox devices.
+A synced multi-tab scratchpad extension for Firefox. Each tab maintains its own content, with rich text formatting and hyperlinks, and syncs across all your Firefox devices.
 
 ## Features
 
-- **Clean Interface**: Full-screen textarea for distraction-free note-taking
-- **Auto-Save**: Your notes are automatically saved as you type
-- **Cross-Device Sync**: Notes sync across all your Firefox devices using Firefox Sync
-- **Simple & Fast**: No login required, no configuration needed - just install and start typing
+- **Multiple Tabs**: Organize separate notes in tabs; double-click to rename, click × to close (with undo)
+- **Rich Text**: Bold, italic, underline, bullet/numbered lists, and hyperlinks
+- **Auto-Save**: Each tab saves automatically as you type
+- **Cross-Device Sync**: Tabs and content sync across all your Firefox devices using Firefox Sync
+- **Keyboard Shortcuts**: `Ctrl+Alt+T` new tab, `Ctrl+Alt+W` close tab, `Ctrl+Tab` / `Ctrl+Shift+Tab` cycle tabs, `Ctrl+B/I/U/K` formatting
 
 ## Installation
 
@@ -50,18 +51,26 @@ The extension uses Firefox's `storage.sync` API, which:
 ## Technical Details
 
 - **Manifest Version**: 2 (Firefox standard)
+- **Extension Version**: 2.0 (multi-tab)
 - **Permissions**: `storage` (for sync functionality)
-- **Storage API**: `browser.storage.sync`
-- **Auto-save Delay**: 500ms after typing stops
+- **Storage**: `browser.storage.sync` for tab content; falls back to `browser.storage.local` per-tab when sync quota is exceeded
+- **Storage Layout**: `tabIndex` lists all tabs; each tab's content lives in its own `tab_<id>` key
+- **Auto-save Delay**: 500ms debounce after typing stops; 5s periodic flush; 10s sync poll
+- **Active Tab**: Persisted per-device in `browser.storage.local` (each device remembers its own focus)
 
 ## Files
 
-- `manifest.json` - Extension configuration
-- `background.js` - Handles opening scratchpad tabs
-- `scratchpad.html` - Main scratchpad interface
-- `scratchpad.css` - Styling
-- `scratchpad.js` - Save/load functionality with sync
-- `icons/` - Extension icons
+- `manifest.json` — Extension configuration
+- `background.js` — Handles opening scratchpad tabs
+- `scratchpad.html` — Main interface (tab bar, toolbar, editor stack)
+- `scratchpad.css` — Styling
+- `scratchpad.js` — Lifecycle and wiring
+- `storage.js` — Storage area initialization (sync with local fallback)
+- `editor.js` — HTML/URL sanitization, formatting commands, link creation
+- `migration.js` — One-time migration from the legacy single-key schema
+- `tabs.js` — Tab CRUD, switching, undo, rename, overflow, document-level shortcuts
+- `sync.js` — Cross-device sync via storage.onChanged + 10s poll, with orphan recovery
+- `icons/` — Extension icons
 
 ## Privacy