Using Sync is optional and you can skip this offer if you do not want to use Sync. So there is no reason not to use Firefox because of this. *https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer

Então como posso salvaguardar os meus favoritos online ? Ou o Mozilla nao tem essa função ?

Hi, there is no such thing in Firefox called Favourites. Bookmarks can be saved by : *https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer Then email it to yourself online account. Doing that for 25+yrs. Or : *https://addons.mozilla.org/firefox/search/?platform=windows&q=backup *https://addons.mozilla.org/firefox/search/?platform=windows&q=Sync For your Profile you can save or not save it as the essential is Bookmarks : *https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles Save to a portable USB drive and if small enough email it to your self or use the above services. Please let us know if this solved your issue or if need further assistance.