Review for accountex by Ric B
Rated 4 out of 5 stars
Accountex is an excellent beginning. One can but wonder why Thunderbird doesn't provide a native capability for exporting account settings for backup or exchange purposes.
If only Accountex could export-import multiple account's settings at a single time (rather than one-by-one) it would be even handier...
To create your own collections, you must have a Mozilla Add-ons account.