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. 
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. 