Migrating from Thunderbird to SeaMonkey (Linux)

[Lef]

I'm looking to move to thunderbird to seamonkey. So far I have already moved from FireFox to seamonkey without much of a hitch (Seafox extension is awesome).

The big issue I have is migrating my newsfeeds. Thunderbird stores them in feeds.json and SeaMonkey stores them in feeds.rdf. I'm not sure how to convert the modern json to the older rdf format.

As well I'm supposing there's no way to get a 'filter messages' like in modern thunderbird in Seamonkey?
And does anyone know of an alternative to:
https://addons.thunderbird.net/en-Us/th ... frequency/
I tried converting an older version of the addon using http://addonconverter.fotokraina.com/ but it doesn't show up in mail view. Essentially I just want a way to view what email addresses are emailing me the most.

Thank you all.

[Lef]

Ok so I managed to write a shell script that converts feeds.rdf to feeds.json.
Unfortunately I also need feeditems in order not to get duplicate entries.
Unlike feeds feeditems don't seem very compatible. feeditems.json has items in a URL whereas feeditems.rdf has things in an URN for instance:
RDF:about="urn:feeditem:tag:theregister.com,2005:story218892"
That URN corresponds to https://go.theregister.com/feed/www.the ... smc_paper/, how does that work? I don't know.

Anyone have a converter for feeditems? I think it's last part of the puzzle...