You can open the three-dot menu in Firefox for Android and open "Sync and save data" or the "Account settings". When you are connected to Sync then this item shows the email address. Easiest is to use "Sign in with credentials".

• https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer
• https://support.mozilla.org/en-US/kb/sync-bookmarks-tabs-history-and-passwords-android

I was completely baffled when trying to do this myself and all the articles in Support had this answer. This "Sync and save data" simply is NOT a choice on my Samsung phone's Firefox app. Finally I found the answer in one of the forums here: Question: "Hi. The option to "sync and save your data" no longer appears in the main menu, nor under settings on my Firefox Android phone. What can I do to get back this option? Your support is greatly appreciated. Thanks in advance."

Answer: "When you have signed into your Firefox Account in Firefox for Android, that option is replaced by your email address. Select your email address from that menu to see the Firefox Sync options."

I just have to say that it was so annoying that all the HELP on Mozilla had the incorrect information!!

If no further questions mark this resolved to remove it from the list and have a nice day.