EXPORT/IMPORT: (Chrome, Safari, Opera)
[Click] X-Notifier envelope icon (Not Right-click)
(See below Step by Step.)
EXPORT: (Firefox, Thunderbird, SeaMonkey)
[Right-click] X-Notifier envelope icon
[Click] Options
[Click] Accounts
[Click] Export
Decide where to save it, and what to name the file ("firefox.xn" is the default)
[Click] Save
[Type] Enter password
[Type] Re-enter password (same password as above.)
[Click] OK