If the disconnected device is indeed suspicious, to keep your information safe, you should change your { -product-firefox-account } password in your account settings. You should also change any other passwords you saved in { -brand-firefox } by typing about:logins into the address bar.
Jeli wotdźěleny grat je woprawdźe podhladny, wy dyrbjał swoje hesło { -product-firefox-account } w swojich nastajenjach změnić, zo byšće swoje informacije wěste dźeržał. Wy dyrbjał tež about:logins do adresoweho pola zapodać, zo byšće druhe hesła změnił, kotrež sće w { -brand-firefox } składował.