Just go to the settings page and you will see the sync section. What security software are you running besides MS Defender? What version of Firefox?

Sync info... FYI... Firefox Sync IS NOT A DATA BACKUP SERVICE https://support.mozilla.org/en-US/kb/how-do-i-set-sync-my-computer https://support.mozilla.org/en-US/kb/how-do-i-choose-what-information-sync-firefox https://www.mozilla.org/en-US/firefox/features/sync/ https://hacks.mozilla.org/2018/11/firefox-sync-privacy/ Sync is not a backup tool but it is a good sync/transfer/move tool https://support.mozilla.org/en-US/forums/contributors/707681

Hello, and thank you.

I have Firefox 138.0.1.

I don't have any security software yet.

Finally, on the Firefox "Settings" page, I don't see a "Sync" section.

I can't send you images of the entire Settings menu, but there's no "Sync" or reference to a possible Firefox/Mozilla account...

Thank you.

Use the snipping tool to make a screenshot. Would be helpful if we could see what you're seeing. Where did you get Firefox from? You are not seeing this? see screenshot What OS?

Hello. I'm sorry, I forgot to include the screenshot. Here are a few.

I downloaded Firefox from several sources to find a solution: -from the mozilla site -from softs'ium

my operating system is Arium 10.8 LTS (64 bit)

my operating system is Arium 10.8 LTS (64 bit)

Arium...

No wonder you're having issues. Someone from Dev will have to chime in because that's not on the support OS list.