Add-ons that store or otherwise handle browsing data must support <a href="https://developer.mozilla.org/En/Supporting_private_browsing_mode">Private Browsing Mode</a>. During a Private Browsing session, no browsing data can be written to disk, and all of this data must be cleared when Firefox quits or the Private Browsing session ends.
Dodanki, kótarež składuju pśeglědowańske daty abo wobchadaju z nimi, muse <a href="https://developer.mozilla.org/En/Supporting_private_browsing_mode">priwatny modus</a> pódpěraś. Za pósejźenje w priwatnem modusu, njedaju se pśeglědowańske daty na platu pisaś, a wšykne z tutych datow muse se wulašowaś, gaž Firefox abo pósejźenje priwatnego modusa se kóńcy.