Version 4.0.0 introduces a major internal overhaul focused on reliability, scalability, and privacy:

Replaced Firefox Sync with a pure local hybrid storage architecture (browser storage + IndexedDB) for effectively unlimited history.
Added manual Export/Import of history as JSON, which now serves as the official way to move data between browsers or devices.
Improved popup history view with better pagination, search, and separate tabs for Videos, Shorts, Playlists, Analytics, and Settings.
Enhanced resume logic so videos and Shorts more reliably reopen near the last watched position, including better handling of channel-page and SPA navigation.
Hardened deletion and tombstone handling so removed videos do not reappear after migrations or imports.
Refreshed tests and documentation to match the new architecture and behaviors.

• Fixed SPA navigation saving issues - Videos that auto-start before save interval initialization now properly track progress
• Enhanced navigation detection - Added multiple fallback methods to catch channel page clicks and other navigation types that bypass standard SPA events
• Fallback timestamp restoration - Added intelligent restoration when YouTube fails to restore timestamps for certain navigation paths
• Improved channel page compatibility - Videos clicked from channel pages now properly resume from saved positions

Technical Improvements

• Multi-method navigation detection - Uses yt-navigate-finish, URL monitoring, history API interception, and page visibility events
• Smart save interval initialization - Checks video state immediately after event listener setup to prevent missed saves
• Event-driven content change logging - Added comprehensive logging for debugging navigation and content loading issues

Fixes

• Fixed video timestamp restoration in YouTube's new player interface - Videos now properly resume playback when loading inside already loaded pages (SAP)
• Improved timestamp comparison logic - More robust detection of YouTube's restoration vs manual restoration needed
• Enhanced error handling - Better recovery when YouTube's restoration mechanism fails

Fix discrepancies in daily/hourly stats by seeding from history when necessary
Ensure accurate short-window charting by computing stats dynamically
Enhance Analytics tab with updated labels showing video counts and minutes

New: persistent local watch-time stats powering faster, more accurate Analytics
UI: channel names now shown under video titles in history
Shorts: more reliable tracking (5s save cadence; relaxed duration checks)
Reliability: improved timestamp validation and timeupdate handling
Export: schema v1.1 now includes stats (backward compatible)
Sync (Firefox): throttled listener to avoid self-triggered loops and flashing
Performance: reduced immediate syncs; background cadence handles stats updates
Misc: version bump to 3.1.2; general fixes and improvements

New: “Remove from history” button on YouTube thumbnails
New: Per‑playlist “Ignore videos” toggle (Playlists tab)
New: Global “Pause history in playlists” setting
Change: Auto‑sync interval now ~10 minutes; immediate sync on updates disabled by default (Firefox only)
Updated: UI and translations to support new settings
Misc: Stability and minor improvements

Fix: Watched overlays restored on YouTube Home after recent layout changes.
Improvement: More reliable video ID detection across new home tiles and playlists.
Improvement: Overlay visibility raised to sit above thumbnails.
Stability: Minor test hardening and internal cleanups.

Tombstone-Based Deletion System:
- Prevents deleted videos from reappearing across devices
- 30-day retention ensures consistent deletion syncing
- Handles stale or inactive devices automatically
Bug Fixes:
- Fixed deleted videos reappearing or restoring immediately
- "Viewed" overlay now works on related videos
Stability & Sync Improvements:
- Improved Chrome MV3 compatibility with better state handling
- More reliable popup behavior and page unload logic
- Enhanced sync conflict resolution and offline support

🌐 Multilanguage Support (i18n)
- Full support for English, German, Spanish, French, and Bulgarian.
- All non-English translations are currently machine-generated. Native speakers are encouraged to contribute improvements!
- All locale keys now use only underscores for Chrome/Firefox compatibility.
📊 Analytics & Statistics Dashboard Redesign
- Completely redesigned Analytics Tab in the popup.
- New summary cards: Total Watch Time, Videos Watched, Shorts Watched, Average Duration, Completion Rate, Playlists Saved.
- Longest Unfinished Videos: List of long videos you haven't finished, with time left and channel info.
- Top Watched Channels: Top 5 channels by videos watched and total watch time.
- Top Skipped Channels: Top 5 channels where you most often skip long videos.
- Completion Bar Chart: Visualizes completion rates for long videos (skipped, partial, completed) with a legend.
- Watch Activity (Last 7 Days): Bar chart of videos watched per day.
- Watch Time by Hour: Bar chart of when you watch the most content.
- Improved data aggregation and display logic for all analytics.
- Better i18n support for all analytics/statistics labels and messages.
🛠️ Other Improvements
- Numerous bug fixes, UI/UX improvements, and codebase refactoring for maintainability.

🔄 NEW: Firefox Sync Integration
• Cross-device synchronization - Sync your watch history across all Firefox devices
• Real-time sync status indicator with manual sync controls
• Local data priority ensures your data is always safe

🎬 Enhanced Video Experience
• Smart timestamp loading prevents video interruption when resuming
• Better YouTube navigation handling without breaking playback
• Improved popup interface with cleaner design

🐛 Bug Fixes & Performance
• Fixed video interruption issues when loading saved timestamps
• Enhanced memory management reduces usage in long sessions
• Faster sync responses and better error recovery
• More reliable storage operations

Firefox users can now enable sync in extension settings to automatically sync YouTube watch history across all logged-in devices!

Console Logging Optimization: Reduced verbose logging in thumbnail observer
Improved Video ID Extraction: Streamlined video ID extraction from thumbnails
Debug Mode Enhancement: Added debug mode toggle in settings with proper persistence
Version Display: Added version number display in settings tab
Error Handling: Enhanced error messages for missing UI elements
Settings Tab: Fixed settings tab not showing/working properly
Theme Handling: Added proper theme preference handling
Success Messages: Added success messages for settings updates
Code Cleanup: Fixed duplicate settingsTab declaration
Performance: Maintained critical debugging logs while reducing noise
Thumbnail Processing: Improved thumbnail observer efficiency
Overlay System: Enhanced overlay handling for all video types
Playlist Support: Added proper overlay support for playlist panel videos
Version Management: Implemented fetching version from manifest.json instead of hardcoding

Added a confirmation dialog before clearing history for safer user experience.
“Clear History” now only removes videos and playlists, not user settings.
Fixed: User settings (theme, overlay, pagination, etc.) now reliably save and persist.
Popup and overlays update in real time as you watch videos—no reload needed.
Improved popup button order for better usability.
Fully compatible with both Chrome and Firefox.

• Add dark/light theme system with system preference detection
• Implement dynamic theme toggle button showing current selection
• Enhance progress column to display watched time and percentage
• Add browser theme integration and automatic theme switching
• Improve UI responsiveness with smooth theme transitions
• Add theme permission to Chrome and Firefox manifests
• Update version to 2.3.0

Technical improvements:
- Enhanced theme detection with multiple fallback methods
- Better error handling for theme-related operations
- Improved cross-browser theme support
- Consistent UI theming across all popup elements

User experience:
- Dynamic theme button displays current selection
- Visual progress feedback with percentage completion
- Seamless theme switching based on system preferences
- Theme persistence across browser sessions

Storage fix, multiple GUI fixes

• Transfer data from IndexedDB to browser.local.storage;
• Fix issue with not saving correct Settings;
• Fix issue with not respecting pagination count;
• Fix issue with hard coded pagination counts in some places;
• Add: better pagination

Local YouTube Video History Tracker

Summary

Never lose track of your YouTube watch progress again! This lightweight extension automatically saves your video timestamps locally using your browser's IndexedDB, allowing you to pick up right where you left off across devices.

Description

Key Features

• Automatic Timestamp Tracking: Saves your position in videos automatically as you watch
• Cross-Device Sync: Works across all your devices when synced with your browser account
• Visual Indicators: Clear "viewed" labels and progress bars on video thumbnails
• Unlimited History: Stores your complete watch history locally without size limitations
• Privacy-First: All data stays on your device - no tracking or data collection
• Customizable: Adjust settings like auto-cleanup period and visual styles

How It Works

1. The extension runs in the background while you watch YouTube
2. It automatically saves your position in each video
3. When you return to a video, it asks if you want to resume from where you left off
4. Thumbnails show visual indicators for watched videos

Privacy & Security

• No data is collected, stored, or shared with any servers
• All information is stored locally in your browser
• Open source code for complete transparency

Technical Details

• Uses IndexedDB for reliable, high-capacity storage
• Lightweight and efficient - minimal impact on browser performance
• Supports all modern browsers (Chrome, Firefox, Edge)

Support

For support, feature requests, or to contribute, please visit our GitHub repository.

Version: 2.1.1

Massive update to the extension.

• Added a popup showing history details - which video was watched, and even in which playlist it was watched;
• Button to remove history per video, per playlist or all;
• Video overlay, showing which video have been viewed and small slider, similar to original YouTube;
• Code optimizations