General
Fixed an issue with the url property of GM_notification when no onclick listener is set
Updated GM_download to initiate downloads in parallel again
Resolved a failure when accessing xhr.responseXML of HTTP responses
UI
Restored the application of custom CSS to installation pages
Fixed quirks in the darker theme
Repaired the 'Sync Now' button
Corrected the 'Save To Disk' button in the editor
Sync
Implemented anonymous requests for WebDAV to prevent overwriting of browser sessions
Fixed WebDAV-based sync in cases of unexpected existing folder structures
Reworked to reduce some authentication requests
Firefox
Enhanced mobile device detection
Disabled unintended debug logging
Fixed the menu command to consistently call the correct callback after a background restart