Moving many emails between folders causes Thunderbird to use massive amounts of memory

[Mike Doherty]

I tried to move many emails (thousands) from one folder to another. This caused Thunderbird to use massive amounts of memory (my system has 4GB, and nearly all was allocated to Thunderbird, with swap space well on the way to being full). Thunderbird froze. Subsequently, Thunderbird brought up the "a script on this page has stopped working" dialog. Even moving about a hundred emails at once causes large and noticeable memory use.