Add-on authors are not obligated to make their add-ons work in beta. Some or all of your add-ons may not work. Or if they do work today, they may not work tomorrow. Consult the <a href="https://support.mozilla.org/kb/thunderbird-add-ons-frequently-asked-questions#w_what-if-my-add-on-is-broken">Add-ons FAQ</a> if you have difficulty. 
Nid yw'n ofynnol i awduron ychwanegion wneud i'w ychwanegion weithio yn y  beta. Efallai na fydd rhai neu bob un o'ch ychwanegion yn gweithio. Neu os ydyn nhw'n gweithio heddiw, efallai na fyddan nhw'n gweithio yfory. Darllenwch ein <a href="https://support.mozilla.org/kb/thunderbird-add-ons-frequently-asked-questions#w_what-if-my-add-on-is-broken">Cwestiynau Cyffredin am Ychwanegion</a> os ydych yn cael anhawster.