When quitting Thunderbird, visible tabs will be saved and will be restored when you open Thunderbird the next time. There is also a Tab menu on the Tab toolbar to help you switch between Tabs.
Toq xkatel pa Thumderbird, xkeyak kan ri tz'etel taq ruwi', chuqa' xkechojmirisäx chik toq xtajäq chik ri Thunderbird. Chuqa' k'o ruk'utsamaj ruwi' pa ri kikajtz'ik taq kisamajib'al taq ruwi', ri nuya' q'ij chawe ye'ajalwachij chi kikojol ri taq ruwi'.