I decided to recreate Firefox Profile folder for the home machine. After backing up the Profile folder and bookmarks and quiting Firefox, I deleted Users/xxxxx/Library/Apllication Support/Firefox folder. Then relaunched Firefox. With a help of Firefox sync and Eversync addon, one by one I recovered addons and bookmarks. Now FVD Speed Dial is running! I assume some of the files in Profile folder was broken or conflicting.