Thunderbird: Export Message Filters and Import across accounts

If there is a need to export and then import message filters in your thunderbird accounts:

Thunderbird Add-On:

https://addons.mozilla.org/en-US/thunderbird/addon/2474

Export Filters:
Tools->Message Filters. Then export the filters into any file.

Import Filters:
Tools -> Import Filters. Then choose the account you want the filters into. Choose the file where the exported filters exist and then apply the filters.