Changes since 1.26.12:

Frequently Visited now appears in the initial New Tab layout without pushing the shortcut grid down after loading.
Frequently Visited sites can be dragged directly onto an empty grid slot to create a shortcut.
Added Hide this site, which hides the entire site domain and its subdomains on that device.
Added a one-time Website Access reminder for users who have automatic favicon learning enabled but have not granted website permission.
Fixed Firefox Frequently Visited not loading correctly through the native Top Sites adapter.
Strengthened SVG and remote-image dimension validation before browser decoding.
Added Firefox/Chrome regression coverage for these changes.

No new required permissions, Sync schema changes, or profile-format changes.

Hardened automatic favicon handling by rejecting images with unsafe dimensions before browser decoding, including raster and SVG favicons.
Strengthened local image integrity by verifying existing stored assets before reuse and safely repairing missing or corrupted image data.
Added new Firefox/Chrome regression tests for image-resource safety and local asset persistence.
No new permissions, UI changes, Sync/profile-format changes, or external services.

Changes since 1.25.16.1:

• Added separate Light and Dark wallpapers with live appearance switching.
• Improved Settings stability around theme and wallpaper changes, including Firefox-specific repaint protection.
• Added live wallpaper previewing while Settings is open without disrupting the Settings panel.
• Added the ability to drag shortcuts back out of folders onto the main grid.
• Improved bookmark folder colors and visual contrast.
• Added GitHub project links to Settings and Welcome.
• Improved Frequently Visited controls; dependent options now appear only when the feature is enabled.
• Strengthened profile import, SVG/image handling, Sync/state concurrency, cache bounds and general input validation.
• Improved favicon recovery, retry handling and background processing.
• Added additional cross-browser regression coverage for Firefox and Chrome.
• Numerous UI, accessibility, performance and reliability refinements.

Added regression tests covering both localization imports and visible version consistency.

Maintenance and compatibility update.

Improved localization loading to remove a Mozilla AMO validator warning.
Preserved lazy loading for all supported languages.
No user data model, Sync behavior or permissions were changed.
Added regression coverage to prevent the warning from returning.

This release contains no functional regressions or changes to MosaicSync’s privacy model.

Major update to MosaicSync with substantial reliability, security and usability improvements.

Added full profile backup and transfer using portable .mosaicsync files.

Improved Sync reliability, conflict handling and recovery across multiple devices and Spaces.

Improved favicon discovery, caching and recovery.

Expanded localization to 32 languages, covering all 24 official EU languages.

Added numerous UI, accessibility and performance refinements.

Further hardened profile import, image handling, storage, CSP/XSS protections and concurrent-write handling.

MosaicSync remains privacy-first, open source and uses Firefox Sync rather than a MosaicSync-operated synchronization server.

MosaicSync 1.23.1

Major update from 1.20.14.2.

Added Multiple Spaces with renameable Personal/Work layouts.
Shortcuts can now be moved between Spaces by drag-and-drop or from the editor.
MosaicSync now opens in both new tabs and new Firefox windows.
Major Firefox Sync reliability improvements, including safer cross-Space moves, interruption recovery and stronger deletion/conflict handling.
Improved first-run migration and Firefox shortcut importing.
Added the new Aether Flow wallpaper and improved the wallpaper gallery.
Improved Settings, dialog alignment, empty-space onboarding and bookmark behavior.
Improved Automatic light/dark appearance detection.
Updated localization across all supported languages, including a major Neapolitan revision.
Added a localized Made in the EU mark.