Hi drobble, Bookmarks are usually one of the categories of data that Sync will synchronize by default. I don't know why it wouldn't, as long as bookmarks are working normally on both installations. Could you make some backups on your Windows 10 system first just in case? I suggest using both formats: * JSON-format Backup: [[Restore bookmarks from backup or move them to another computer]] * HTML-format Export: [[Export Firefox bookmarks to an HTML file to back up or transfer bookmarks]] If you can add and edit bookmarks on both installations, I think they should synchronize. Perhaps another support volunteer knows where to find troubleshooting messages related to Sync. If you have to use the files to transfer your bookmarks: * JSON-format Backup -- this will completely replace your Linux bookmarks: [[Restore bookmarks from backup or move them to another computer]] * HTML-format Import -- this will add the imported bookmark either to the menu or under an "Imported Bookmarks" folder: [[Import Bookmarks from an HTML file]]