Hey, Gloria! I'm sorry to hear about your issue. The first solution to come to my mind would be to make sure you are logged into your browser as all of your favorite webpages and logins are bound to your Firefox account.

“Favorites” don’t remain on “Favorites” bar; there is no way to edit (e.g., resequence) them; other (e.g., recently visited) sites are added indiscriminately (with as usual no clear instructions to control this on MOBILE—not laptop—devices). When noted online the answer is, see the forum, wherein I find answers such as “Sorry to hear that, I dunno the answer.” Altogether disappointing.