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In the filter management window, it adds a buttons to enable export of filters, however import doesn't seem to work. It can only import from "Becky internet mail".
It hijacks your internet browser to a .ru-based site, but it seems to have been resolved after removing the add-on and reinstalling the browser. Still too risky and cumbersome to just get half the solution. Considering abandoning Thunderbird, as it's not a long term viable solution. :(