== Maintaining the bug database ==
The bug database aka [https://bugzilla.mozilla.org bugzilla] is the tool used by developers to track defects in the product.
The database is open to anyone who wants to let the developer knows about issue with Thunderbird.
Work in this areas is based on understanding the product, the protocols and what he users are seeing. No need to be too technical - but it takes time to get acquainted with how things work and this activity is more time consuming than testing.
More information on this activity can be found here.
== Writing automated tests ==